Antique radios, Old Time Radios
35
| Country: |
United States of America (USA) |
|
Brand: |
Common type USA |
| |
Tube type: |
Screen-grid Tetrode RF/IF-Stage Controlling (mu) |
|
Tube ID = 2662 |
 |
| Identical to |
35 = 35/51 = 235 = 251 = UY-235 = A235 = RENS351 = 435 = 51 = VT-35 = UY235 = F235
|
| Similar
Tubes |
Normally replaceable-slightly different:
151; 38035; 51S
|
| First Series |
1931 -- Collector info (Sammler) |
| First Source
(s) |
Jun.1931 : -- Collector info (Sammler)
|
| Successor Tubes |
35/51
|
|
| Base |
UY-Base, 5 Pins (USA, April 1927) (Codex=Ha)
|
| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 2.5 Volts / If: 1.7 Ampere / -: Indirect / -: Parallel, (AC/DC) / |
| Description |
In 1929 begins the problem of cross modulation in the USA caused by strong signals of similar frequency and nonlinearities in the first stage. Stuart Ballantyne and Harold A. Snow (Boonton Research Corp.) found a first answer with the tube 551 later called 51 (Arcturus, Majestic, Raytheon May 1931) with "gradual cut-off" (vari-mu, gradual cut-off, GE experimented in 1919 in vain). Probably first publ. IRE paper December 1930. Soon after the 551 RCA came with the same tube called UY235 (235 later 35 and later joined as 35/51, in Japan UY-235). An article, June 1931 in "National Radio News" shows how necessary they were. In short: Trade show in Chicago in 1931 73% pentode and 94.5% variable-mu tubes. In the same year Philips brought the E445 and Cossor the 220VSG. This was a "super control feature for AVC" as Silver-Marshall stated for model 726. The problem: a great negative voltage is necessary and therefore a special AVC tube is involved for the RCA solution. See General Motors model 220 S-10B (1931). Philco used the Wheeler invention (released Oct. 1929) with its model 95 Screen Grid (1929) where a UY-227 triode works as a combination: detector and AVC diode.
|
| Tube prices |
0 Tube prices (visible for members
only)
|
| Literature |
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49
|
|
|
| |
|
| |
Internet
Miguel Angel Trujillo-Rodriguez
|
|
|
|
Patrice ZEISSLOFF
Patrice Zeissloff
|
|
Telefunken Werkstattbuch
Wolfgang Bauer
|
|
Cunningham Radiotron Manual
Peter Hoddow
|
|
|
 |
| Further Information for |
35 |
|
|
35 naming conventions
(13.10.2005) John Hupse
|
Clicks: 619 Replies: 5 |
The "35" tetrode was introduced in May 1931 by RCA as the "RCA-235". Not in 1935. It is the world's first variable-mu tetrode. A few month later Philips introduced the European version, the E455. The number "1", "2", "3" or "4" etc. before the type number (e.g. 235 instead of 35) was used to indicate the brand. In the RMorg database this additional number is used in a rather arbitrary fashion. A more concise method is to use a 2-digit model number for these tubes. So do not use "301A" or "UX201A", use "01A". Do not use "235" or "RCA235" or "435" but use "35". This will be easier for the database user (the Collector) and easier for the database administrator.
More ...
|
| |
|
| 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] |
