radiomuseum.org

 
Please click your language flag. Bitte Sprachflagge klicken.

EM34

Information - Help 
ID = 979
       
Country:
Europe
Brand: Common type Europe tube/semicond.
Tube type:  Mag. Eye, 2 ranges, 2 shadow angles   Indication 
Identical to EM34 = 6CD7 = 6M2 = 64ME = CV394 = MEM34
Similar Tubes
Normally replaceable-slightly different:
  6AF7G ; EM35
Other base:
  EM4
First year 1946 -- Collector info (Sammler) Philips UK 170A/15
First Source (s)
Aug.1950 : Funk-Technik (FT) # 15
Predecessor Tubes EM4   6AF7G  
Successor Tubes EM80  

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=U)
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Parallel / series AC/DC /
Description

Dual Shadow indicator. Maximum shadows at Vg=0 on both.
Min shadows at Vg = -5 and -12.5 with Va=200 and Ra1 and Ra2=1M. (RJ)

 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
28 x 90 x mm / 1.10 x 3.54 x inch
Weight 29 g / 1.02 oz
Tube prices 67 Tube prices (visible for members only)
Literature - - Manufacturers Literature   
Taschenbuch zum Röhren-Codex 1948/49   

  em34_1.png
  EM34: Courtesy Bureau Belper (De Muiderkring, Bussum)
Michael Schlör
 
em34~~6.jpg
EM34: aus eigener Sammlung
Peter Roggenhofer

 
sockeloc47.png
EM34: RTT 1974 Franzis
Anonymous 61 Collector

 
em34_data.png
EM34: Funkschau Röhrendokumente
Michael Schlör


Usage in Models 1= 1942? ; 1= 1945 ; 3= 1946?? ; 2= 1946? ; 18= 1946 ; 5= 1947?? ; 5= 1947? ; 26= 1947 ; 12= 1948?? ; 10= 1948? ; 22= 1948 ; 11= 1949?? ; 17= 1949? ; 80= 1949 ; 58= 1950?? ; 26= 1950? ; 157= 1950 ; 14= 1951?? ; 50= 1951? ; 275= 1951 ; 36= 1952?? ; 44= 1952? ; 304= 1952 ; 51= 1953?? ; 65= 1953? ; 287= 1953 ; 38= 1954?? ; 66= 1954? ; 332= 1954 ; 51= 1955?? ; 44= 1955? ; 247= 1955 ; 14= 1956?? ; 45= 1956? ; 183= 1956 ; 8= 1957?? ; 26= 1957? ; 131= 1957 ; 4= 1958?? ; 18= 1958? ; 96= 1958 ; 9= 1959? ; 20= 1959 ; 15= 1960?? ; 1= 1960? ; 3= 1960 ; 4= 1961?? ; 1= 1961? ; 1= 1961 ; 3= 1962? ; 1= 1962 ; 4= 1964 ; 5= 9999

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):2950


Collection of a member from D
Collection of a member from D
Collection of a member from FIN
Collection of a member from FIN

Forum contributions about this tube
EM34
Threads: 10 | Posts: 37
Hits: 10026     Replies: 2
  Replacing the EM34 by the 6E5C
Jacob Roschy
03.Aug.10
 
  1

In many cases it's possible to replace the rare and expensive eye tube EM34 by the Russian 6E5C (6e5s). (This 6E5C is an octal-base version of the American 6E5 (with UX6 Base)).

The EM34 has two shadow angles with different sensitivity, which requires two triode units inside the bulb with different amplification as control preamps.

Unlike to the EM34, the 6E5C has only one shadow angle, which then requires only a single triode. 

Replacing the EM34 by a 6E5C requires the urgent need of the rewiring of some socket connections, as otherwise the 6E5C will be destroyed and severe damage of the circuit may happen !  

Note the base diagrams of the EM34 and the 6E5C for a proper rewiring.

The 1 MegOhm resistor R1 at pin 3 (a1) will be retained, while the former resistor R2 (at a2) will be dropped.

Replacing the EM34 by the EM84

In many cases it's possible to replace the EM34 magic eye by the magic bar tuning indicator EM84, as the example by the Philips BF510A clearly proofs.

On the left one can see the EM84 without input signal, which demonstrates that nothing of the indication sweep is left.  

The space laterally of the EM84 fluorescent bar should be covered by suitable material and colour. 

The EM34 has two shadow angles with different sensitivity, which requires two triode units inside the bulb with different amplification as control preamps.

Unlike to the EM34, the EM84 has only one moving pattern which then requires only a single triode.

Replacing the EM34 by a EM84 requires the change of the socket with adequate wiring.

Note the base diagrams of the EM34 and the EM84 for a proper rewiring. 

Both the 1 MegOhm resistors R1 and R2 will be dropped and replaced by a new 470...500 kOhm resistor R3. Additionally a jumper between anode triode (aT) and control rod (st) is required (pin 7 to 9).

Don't forget the rewiring of the heater connections.

Michael Watterson
16.Jan.12
  2

If the 6e5s (Cyrillic 6E5C) is too sensitive (close on too weak a signal), as is likely, then put a resistor divider such as 3M3 Ohms in series with grid and 1M Ohm from grid to ground will give about 1/4 sensitivity.

I just replaced an EM34 and at first the tube didn't light at all. The pins of the 1985 NOS tube had tarnished in store, a wipe with a hard "ink" eraser/rubber cured it.

Don Jaksa
06.Feb.12
  3

I used a 6E5C to replace a EM34. I was pleased with the results but the eye was too sensitive.

I will use the 3M3 Ohms in series with the grid.

I think I already have a 1M from grid to ground

Thanks

Don in Scottsdale, AZ

 

 
Hits: 2125     Replies: 0
EM34 Faulty and 'repaired'
Michael Watterson
18.Nov.11
  1

Initially the tube was completely illuminated, though dim apart from a bright part flickering shadow open and closed about 1 or 2 degrees, but very intermittent. Mostly fully closed.

The AVC/AGC and drive to grid fixed (a separate story) and the opposite shadow now fully open with no signal and closing with stronger station. But the "occasionaly flickering slightly open" shadow remained fully closed.

The working shadow seems to be pin 3 (sensitive? closed g = -5V) and "broken" flickery shadow (fully closed) the pin 6 (coarse closed g = -12V?).

Repair
So I disconnected the 1M on pin6 and the bottom other shadow still worked. Disconnecting 1M on pin 3 no moving shadow.

It seemed like leakage or something so I momentarily shorted unconnected pin 6 to 0V and got a "crack" of a spark.

The EM34, while still dim, now works perfectly. One sensitive shadow and the formerly broken shadow is less sensitive and fully open instead of closed on no signal. A really strong shortwave station will close both shadows (the rarely used part being brighter).

Background
The EM34 tube is in a possibly 1949 or 1950 Pye 39 JH/E  (no mistake!) It was found walled up under a staircase during renovations of a house in West Limerick. I'll write up on the radio set repair/restoration after I get the model created. These are similar but no Magic Eye PYE 39J/H (closest) and PYE A39 J/H.

If the repair is only consideration  then a 6e5s (Cyrillic 6E6C) could be fitted with wiring change or adaptor. Pure "Restoration" would see the EM34 retained. However I want to listen to this set regularly. So I may fit a 6e5s (Cyrillic 6E6C) and attach the EM34 with a note and circuit changes inside the cabinet.

update:

It was intermittently loading HT line, so I unplugged it and between the various electrodes apart from grid (a1, a2, T, k) in every combination connected by capacitor leakage tester with a 1uF capacitor charged on its connector (nearly 360V at very low impedance for short period). The Magic Eye is now performing perfectly though dim but just usable.

"Repaired" EM34 with weak and strong signal
(Top shadow needs very strong signal to close, bottom is more sensitive)

 

 
Hits: 6898     Replies: 0
Ersatz der EM34 durch die 6E5C (6e5s)
Jacob Roschy
02.Aug.10
  1


Sofern es die Platzverhältnisse zulassen, kann als Ersatz der EM34 die russische 6E5C (6e5s) verwendet werden. Diese ist eine Octal- Version der amerikanischen 6E5 mit UX6-Sockel.  

Die EM34 hat zwei Leuchtwinkel unterschiedlicher Empfindlichkeit. Demzufolge ist in der Röhre eine Doppeltriode mit unterschiedlicher Verstärkung untergebracht.   

Im Gegensatz zur EM34 hat die 6E5C nur einen einzigen Leuchtwinkel. Eine Anzeigeänderung bewegt sich also nur in etwa ¼ des Leuchtfeldes, während der Rest nur ständig gleichmäßig vor sich hin leuchtet. Daher ist auch nur eine einfache Triode zur Vorverstärkung eingebaut.  

Die Octalfassung kann bei der 6E5C zwar beibehalten werden, muss aber unbedingt umverdrahtet werden, da sonst die volle Anodenspannung von 250 V über Stift 5 zum Steuergitter der 6E5C gelangt, wo sich bei der EM34 der Leuchtschirmanschluss befand ! 

Beachten Sie zur Umverdrahtung die Sockelschaltbilder der EM34 und der 6E5C !

Der 1 MOhm- Arbeitswiderstand R1 an Stift 3 (a1) bleibt erhalten, der bisherige Arbeitswiderstand R2 an Stift 6 (a2) entfällt.

 

 

 

 

Ersatz der EM34 durch eine EM84
 

In vielen Geräten lässt sich eine EM84 problemlos anstelle einer EM34 einbauen, wie hier am Beispiel eines Philips BF510A zu sehen ist. Ganz links ist die Anzeige ohne Empfangssignal, es geht also nichts vom Anzeigebereich verloren.

Die EM84 sollte seitlich des Leuchtbalkens in passender Farbe zur Umgebung abgeklebt oder abgedeckt werden (was nur im Betrieb vorgenommen werden kann).

Die EM34 hat zwei Leuchtwinkel unterschiedlicher Empfindlichkeit, demzufolge ist in der Röhre eine Doppeltriode mit unterschiedlicher Verstärkung untergebracht.

Im Gegensatz zur EM34 hat die EM84 nur einen einzelnen Leuchtbalken, daher ist auch nur eine einfache Triode zur Vorverstärkung eingebaut.

Beachten Sie zur Umverdrahtung die Sockelschaltbilder der EM34 und der EM84 !

Die beiden 1 MOhm- Arbeitswiderstände R1 und R2 entfallen, dafür erhält die EM84 einen neuen Arbeitswiderstand R3 von 470...500 kOhm. Außerdem ist an der EM84 eine Verbindung vom Steuersteg st zur Anode Triode aT vorzusehen ( Stift 7 nach 9).

Vergessen Sie natürlich auch nicht die Umverdrahtung der Heizung !

 
Hits: 4769     Replies: 0
EM34 (EM34) Ersatz
Konrad Birkner † 12.08.2014
30.Nov.06
  1

Es gibt keine Austauschtype. Da neuwertige Exemplare extrem teuer sind, und man auch zögern wird, sie durch häufigeren Betrieb zu verschleissen, bietet sich ein akzeptabler Ausweg (ausser für Puristen).

Die 6E5C russischer Herkunft (hier im RMorg als 6e5s geführt, wegen der kyrillischen Buchstaben) kann die Funktion der EM34 mit folgenden Einschränkungen ersetzen:

- die Beschaltung ist zu ändern
- sie hat nur einen Leuchtwinkel

Zur Beschaltung
folgende Anschlüsse sind umzulöten 
6 kommt auf 1 (A2, nicht benötigt, aber Widerstand für evtl. Rückbau belassen) 
5 kommt auf 6 (L)
4 kommt auf 5 (G)

Im Gerät sollte ein Warnhinweis angebracht werden:

Umgebaut auf 6E5C. Dies ist kein direkter Austauschtyp für die EM34.
Sollte wieder eine EM34 eingesetzt werden, ist unbedingt ein entsprechender Rückbau erforderlich. Andernfalls würde die EM34 durch Überlastung zerstört!

Bei Veräusserung eines umgebauten Gerätes gebietet es der Anstand, auf die geänderte Bestückung hinzuweisen (nicht erst nach Rückfragen)!
Als Ersatz im Sinne von austauschbar darf dies keinesfalls ausgegeben werden.

Meine Empfehlung als Kurztext in Angeboten:

             Von EM34 auf 6E5C umgebaut

 
Hits: 2413     Replies: 2
EM34 function
Philip Navarrete
25.Oct.06
  1

Just what is the EM34 Eye supposed to do? My EM34 does not give the eye indication at all in FM. It's dark and blank. From what I remember the eye is supposed to open and close as stations are changed. Could I have a bad EM34?

Philip Navarrete

 

Thread moved to tube

Thomas Albrecht
26.Oct.06
  2

Philip,

The EM34 is a dual-action eye tube.  It should glow brightly, with a dark wedge at both the top and bottom of the face.  One of the two wedges is more sensitive than the other.  For example, on a weak station, only the more sensitive wedge changes width.  On a very strong station, the sensitive wedge is saturated, and the less sensitive shows some width change.

If the tube doesn't glow at all, check the plate and grid voltages to make sure there isn't a problem in the surrounding circuitry.  Unfortunately, it is not uncommon to find very dark or completely dark eye tubes.  Most used ones have low emission.  The lifetime of these tubes is only 1000 hours or so.  If the radio was used frequently, the eye tube could easily have worn out in the past.  Since the radio still functions fine without a working eye tube, many radio owners never bothered to replace the eye tube.

Best regards,

Tom

Philip Navarrete
26.Oct.06
  3

Thanks Tom I'll check the voltages.

Phil

 
Hits: 2892     Replies: 4
Looking to buy EM34
Philip Navarrete
25.Oct.06
  1

Is anyone selling EM34?

Philip Navarrete

 

Thread moved to tube

Maitiu Standun
25.Oct.06
  2 hi philip, what is em34?????? regards maitiu
Arpad Roth
25.Oct.06
  3

 It´s a magic eye.

http://www.radiomuseum.org/tubes/tube_em34.html


Philip Navarrete
25.Oct.06
  4

Hi Arpad,

I went to that website and saw eBay Germany. I do I access that?

Philip Navarrete

Thomas Albrecht
26.Oct.06
  5

Philip,

An EM34 can be quite expensive.  I generally see prices ranging from about US $35 to $100 on the web.  Some of the least expensive offers I see advertised right now are:

http://www.elexs.com/5Rcvg.htm  (look under 6CD7)

http://www.hamtubes.com/tubes/list2.htm

I don't know whether either of these really has an EM34 in stock at these prices, but they may be worth a try.

Some of the more well-known suppliers that also have EM34/6CD7 (albeit at higher price) include:

http://www.radiodaze.com/tubes-03.htm

http://www.tubedepot.com/

http://www.vacuumtubes.com/price3.html

If you shop for a tube on e-Bay, you'll need to register, and bid on the tube in an auction.  Sometimes they have a "Buy it now" price where no bidding is necessary.  You must be very careful on e-Bay, since you're simply buying from a private person, and there is no way to guarantee that the tube is good.  You have to trust the seller's description and feedback.

The reference you saw to "e-Bay Germany" on the link above (which is simply to a page here at the Radiomuseum.org site with data on the EM34 tube) is a price reported by one of the members here for a recent sale of a tube on e-Bay Germany.  It doesn't mean that an EM34 is necessarily for sale right now on e-Bay Germany.

Good luck!

Tom

 
Hits: 4266     Replies: 2
EM34 (EM34) Bezugsquelle
Werner Riethmüller
19.Dec.05
  1 Kann mir jemand sagen wo man noch neue EM34 bekommen kann?
Danke
Werner Riethmüller
Peter von Bechen
19.Dec.05
  2 Hallo Herr Riethmüller,
neue EM34 sind nicht leicht zu bekommen. Ersatzweise macht sich die russische 6E5C ganz gut, die hat auch einen Oktal-Sockel. Allerdings muss man ein paar Drähte an der Fassung umlöten.
Infos unter www.die-wuestens.de unter Röhren.
Martin Steyer
19.Dec.05
  3 Hallo Herr Riethmüller,

Infos gibt es im RM, da muss man nicht außerhalb suchen:


http://www.radiomuseum.org/forum/magisches_auge_6e5c_russisch_als_ersatztyp_fuer_em34_ua.html

Herzlichen Gruß,
Martin Steyer
 
Hits: 3319     Replies: 3
EM34
Onno Massar
23.Aug.05
  1 Hello Ernst,
The indicated first production year of the EM34 in the valve should be corrected.
I have 2 radio's that use the EM34 that are older:
a Philips BX560A from 1947, the model was first produced in 1946.
a Philips (GB) 170A/15 from 1946.

Regards,
Onno Massar
Ernst Erb
23.Aug.05
  2 Dear Onno
Thank you very much for your comment. I have changed the date of the EM34 to 1946 - just on ground of this model of yours. One can see only very limited usage in models in 1947 and 1948 but a sharp rise in 1949. Time will show if 1946 is really correct. I have also seen sets with the EM34 for much earlyer sets (with two question marks) and corrected either the magic eye to "unknown" plus text or found the correct but later year.

Only by such remarks of guests or members we can gradually find errors. Thank you.
Onno Massar
23.Aug.05
  3

Oops, the BX560A has an EM4 not an EM34.
Onno

Jacob Roschy
29.Aug.05
  4

From 1938, Philips and Mullard (owned by Philips) started to supply Great Britain with valves of the so-called "Red Series", but fitted with the American Octal base instead of the side-contact base, as usual in continental Europe.

 

The type number was formed by adding 30 to that of the corresponding side-contact valve. The side- contact EBC3 became the Octal EBC33, the EF9 became the octal EF39,
as well the EM34 became the octal version of the EM4.


Since the EM4 appeared in 1939 in continental Europe, it is most likely, the EM34 appeared at the same time in the UK, but not yet in continental Europe.

 

As the Rimlock series appeared, the EM34 was allocated as tuning indicator to the Rimlock valves. So it is very likely, in continental Europe the EM34 was first found at radios fitted with Rimlock valves in the later 1940s.

 

Best regards,

Jacob Roschy
 
Hits: 2797     Replies: 1
EM34 Leuchtstoff Alterung
Gottfried Silberhorn
19.Mar.05
  1 wenn so ein magisches Auge nur noch schwach leuchtet,
ist nicht die Kathode verbraucht, sondern der Leuchtstoff,
das habe ich hier gelesen.
2 Fragen habe ich dazu:
Altert der Leuchtstoff nur an den Stellen, wo er auch leuchtet,
oder gleichmäßig überall ?
Und wovon hängt die Alterung noch ab,
Temperatur, oder Sonnenlicht ??
D.h. wenn ein Radio 50 Jahre in einem dunklen Keller gestanden ist,
ist das magisches Auge dann noch gut ?
Danke,
Gottfried Silberhorn
Jacob Roschy
19.Mar.05
  2

Hallo Herr Silberhorn,

bei magischen Augen verbraucht sich die Leuchtschicht nur dort, wo sie auch angesteuert wird, also leuchtet. Das kann man gut an solchen magischen Augen beobachten, die in Radios betrieben wurden, die immer nur schlechten Empfang hatten und das MA nur wenig ausgesteuert war. Steuert man dieses MA nun mit vollem Signal an, leuchtet der bisher unbenutzte Teil wie neu, auch wenn der Rest schon voll verbraucht ist.

Ob Tageslicht einen Einfluss auf die Alterung hat, bezweifele ich sehr, sowas wurde noch nie berichtet.

MfG JR

 
Hits: 23817     Replies: 13
How to adapt mag.eyes like EM34 or EM85
Ernst Erb
06.Jun.04
  1

Omer, a new member from the U.S. would like to get an answer on this topic:

Even though I haven't become an official member yet, I might suggest a page or a link on your site that shows how to adapt an em34 socket to use a 6E5C tube or a link that shows how to adapt an em85 to a em80. The way vacuum tubes are available and the way audiophools are jacking up NOS tubes, I think there should be a discussion on solid state rectification as well, circuitry that wouldn't harm the vacuum tubes on start up as replacement modifications to keep old radios running. Vacuum Tube Valley in California has some recommendations.

For the discussion on solid state rectification he will open a new thread (I hope).

Hans Kamann
19.Aug.04
  2

The following is taken from my homepage and translated into english:

EM34 -> 6E5C


Usually both screens of the EM34 are used parallel. Therefore you´ll find two resistors mounted from PIN5 (L)to PIN3 (a1, d1) and from the same PIN5 (L) to PIN6 (a2, d2).

6E5C has only one screen hence only one resistor ( 1 MegOhm) will be used:


One Resistor is mounted from PIN6 (L) to PIN3 (A).

PIN6 (L) gets the wire which was originally mounted to PIN5 (L).

PIN5 (G) gets the wire which was originally mounted to PIN4 (G).

The socket has to be turned by about 45 degrees since the 6E5C Screen is aligned different to the EM34 ones.

We recommend keeping a sketch of the original wiring with the set.

Pinning EM34:

PIN Ident.
1 not used
2 f
3 a1, d1
4 g
5 l
6 a2, d2
7 f
8 k, g

Pinning 6E5C:
PIN Ident.
1 not used
2 F
3 A
4 not used
5 G
6 L
7 f
8 K


EM80 -> 6E1N

It is quite easy to swap a worn out EM80 with a new 6E1N. The pinning is identical so just replace without any changes to the existing wires. Bear in mind that the dimensions of the russian type are slightly different to the EM80 but in most cases this won´t be a problem.

EM85 -> 6E1N

This can be a tricky one since the EM85 has, in addition to the Magic Eye, a seperate Triode System which could be used for other purposes in your radio set. So please be carefully and check schematics first !

To avoid damages to your radio set we do not propose any changes here. 

Below are pictures and pinnings of EM85 and EM80, taken from Franks Tube Page which is highly recommended to any radio collector http://frank.pocnet.net/sheetsE2.html. Possibly you can find a way of changing wires for your set. Above example with EM34 may help.

EM85


EM80
Wolfgang Bauer
28.Jun.05
  3
Ich habe dieses Mail von unserem Mitglied, Frau Marianne Gibson aus Santa Rosa, USA erhalten.


A new member from USA requests tube information for EM34, other tubes, and Mystic Mystro Connection for Grundig Konzertschrank 9070 (Musical Instrument U.S.A. 9070).
 
    I am beginning to navigate the website and an looking for information on an EM34 tube.   Is it suggested in this thread that the EM34 be substituted with the tubes mentioned in the above article?   Some of the tubes I am searching for have an English equivalent naming, and some are not listed.   Is there a possibility one of you have a name equivalent for the tubes EM34, EBC 41, EBF 89, EAA91 and EL95 ?   The 9070 has a Mystic Mystro Connection that is missing on the console we are restoring.   Is it a remote control of some kind?   Does this thread relate to the Mystic Mystro Connection?   Thank you for your assistance.
 
Marianne Gibson

Hello Mrs. Gibson

EM34 = see in the above article
EBC41 = ?
EBF89 = 6FD12
EAA91 = 6AL5
EL95 = ?

What do you mean with "Mystic Mystro Connection" ? Do you mean the connection on the rear, it is for a cable-remote-control.

Regards to you
Wolfgang Bauer
Konrad Birkner † 12.08.2014
28.Jun.05
  4 I am quoting the "Essential Characteristics" by General Electric:

EM34 = 6CD7
EBC41 = 6CV7
EBF89 = 6DC8
EAA91 = 6AL5
EL95 = 6DL5

This is in accordance with information from the German "Franzis- Roehren-Taschen-Tabelle", 11th edition

Kind regards
KoBi
Ernst Erb
28.Jun.05
  5 Dear Konrad
Thank you for the information.
I have entered those as equal types.
Paul Moyer
09.Nov.05
  6 Is it possible to buy a 6E5C tube in the US?  The only 6E5 tubes I have found so far do not have an 8-pin base.
Omer Suleimanagich
10.Nov.05
  7 Please check out the site, http://www.thetubestore.com/ru-6e5c.html

You might want to check EBay too.

I hope that members of this forum again can make a collective offer to purchase vacuum tubes/valves for members, like last year!

I hope this helps.

Omer
Bob Isaac
15.Oct.10
  8

I've found a very comprehensive page concerning 'magic eye' tube substitutions.
It is called magiceyetubes com

The tube numbers listed in a 'green' color have been tested/verified, those in the color 'red' are from various published sources, but have not been tested/verified by the website author.

 

Using the information contained at that page, I decided to buy an inexpensive 6DG7 to replace the much more rare EM85 from a Ducretet radio I am repairing for a friend.  The 6DG7 is in fact an exact electrical match to the EM85 and works flawlessly.  I was able to purchase the 6DG7 for a mere $9 US from a vendor on the NET. 

 

Thank you,

Bob

Ernst Erb
15.Oct.10
  9

Dear Bob
According to our tube date pages, the only 6DG7 known to us, is a pentode, which is a noval base version of the well known 6BA6 / EF93. The pictures clearly prove, that this

pentode 6DG7

really exists, as well as it is mentioned in current data books.

Your sentence: "I was able to purchase the 6DG7 for a mere $9 US from a vendor on the NET." Looks to me as if you would get that pentode - but I might be quite wrong. Have you received the 6DG7 as a magic eye? What is the brand and where did you buy it if it is a magic eye?

In any case: We want to have full information (self efficient) here and not links - which may be true or may not be true, wich can be changed or deleted ... We don't want to build up link graves. I therefore have deleted that link. But because the site can be quite useful, I have written the name of it.

If you have information on that tube, can you please give it to Jacob Roschy or Otmar Jung? You find members eMail addresses in the member list. He will then create that new tube and you can upload the picture. You can also offer more tube data or replacement hints etc. Our tube pages should be most complete and reflect all known facts.

Would be nice if you would load up a new portrait picture of yours in the "normal size".

Thanks for your cooperation. You are welcome.


 

Bob Isaac
15.Oct.10
  10

Hello Ernst,

 Thank you for the information.  After reading the data you provided, the one I purchased most likely IS a pentode!  The brand of tube was not listed. I will let you know once it arrives.

This the base diagram they listed for both the 6DG7 and the EM85 (as well as others):

I had never heard of this supposed "eye tube" before reading about it at that website, but thought I would take a chance.

Thanks again,

Bob

Jan Terranea
18.Oct.10
  11

Helo all,

This magic eye thread is very interesting.

The Radio Valve Data Book, (Iliffe Books LTD London 1966) mentions the EM85 made by Brimar as an obsolete type, so there may have come some successor of this tube-type.

In  the Muiderkring Electronic Tube Handbook 19th edition 1981, the EM85 and 6DG7 are mentioned to be the same tube with different designation.

Duncan's TDSL mentions another one, the 6DH7, as identical or close to the EM85.

So it is possible that there are two different tubes with the same name:6DG7

Regards, Jan Terranea.

 

Per Abildskov
08.Jun.11
  12

Hi Ernst,

I have two brand new EM34 Magic eyes from Chelmer Valve.I was planning to use one in my beautiful Philips Royal Opera FDK543 that you kindly issued pictures of on the Radiomuseum. Unfortunately they are too wide in radius to fit the hole in the wooden cabinet. I therefore purged an 6EC5C from Germany for 25€ incl. shipping. It has a drawing with it how to modify the the connections on the socket and fits nicely.

Best gards,

Per.

Omer Suleimanagich
09.Jun.11
  13

Be aware, the radius of the 6E5C is wider than an EM34 tube.  I would suggest going in and seeing why the EM34 tube/valve is not able to fit.

Per Abildskov
09.Jun.11
  14

Actually the 6EC5C is a little smaller and it fits perfectly. The problem is that the Valve has to fit inside the Philips plastic logo in the front of the radio.You are right that the original Philips EM34 is a little smaller than the 6EC5C, but by removing the filt inside the logo it worked.

Regards,

Per.

 
EM34
End of forum contributions about this tube

You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]
  
rmXorg