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Popular Model A-C Eliminator Type B

Popular Model A-C Eliminator Type B; Lissen Ltd.; London (ID = 364783) Power-S
Popular Model A-C Eliminator Type B; Lissen Ltd.; London (ID = 341503) Power-S
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Popular Model A-C Eliminator Type B; Lissen Ltd.; London (ID = 341503) Power-S
Lissen Ltd.; London: Popular Model A-C Eliminator Type B [Power-S] ID = 341503 818x700
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For model Popular Model A-C Eliminator Type B, Lissen Ltd.; London and Richmond, Surrey
Country:  Great Britain (UK)
Manufacturer / Brand:  Lissen Ltd.; London and Richmond, Surrey
Year: 1930 ?? Category: Power supply/conditioner or battery or charger 
Valves / Tubes 1: U625
Wave bands - without
Power type and voltage Alternating Current supply (AC) / 100-110 OR 200-250 Volt
Loudspeaker - - No sound reproduction output.
Power out
from Model: Popular Model A-C Eliminator Type B - Lissen Ltd.; London and
Material Bakelite, TUBES VISIBLE
Shape Tablemodel, with any shape - general.
Dimensions (WHD) 245 x 100 x 85 mm / 9.6 x 3.9 x 3.3 inch
Notes Text on the unit reads "Lissen. Popular Model A-C Eliminator Type B 200 V 250 V". This has 3 HT outputs. Outputs 1 & 2 are variable, each adjusted with a Knob on the top of the unit.
Net weight (2.2 lb = 1 kg) 1.9 kg / 4 lb 3 oz (4.185 lb)
Price in first year of sale 4.00 GBP
Source of data - - Data from my own collection
Mentioned in - - Manufacturers Literature

Model page created by Keith Staines. See "Data change" for further contributors.

All listed radios etc. from Lissen Ltd.; London and Richmond, Surrey
Here you find 145 models, 109 with images and 54 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


Forum contributions about this model
Lissen Ltd.; London: Popular Model A-C Eliminator Type B
Threads: 1 | Posts: 9
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lissen: Type B; Popular Model A-C Eliminator
Keith Staines
I have recently acquired a Lissen battery eliminator. It is fitted with a valve rectifier which is without markings except for "U625" hand written on the base. However I have been unable to find any record of a U625 valve. The valve has a B4 base. I would be grateful if anyone can help me discover what the valve should be.
Roy Johnson

Hello Keith,

That is an interesting find!      I too have no reference to the U625, but is there any chance that it could be U695?   This valve is reported (Stokes) as being marketed, even manufactured by Burndept and the dates would agree as the Type B eliminator was marketed in the late 1920s.     Is picture possible, please of this specimen?

Lissen as far as is known never manufactured valves, but badged them, so would have relied on other sources such as Burndept.

Best regards,



Keith Staines

Hello Roy,

Thanks for the reply.

I have taken two photos, a general view & a close up of the stem. Neither shows the hand written text on the base, which I couldn't get to show on the camera. But this I think was added well after manufacture. On the stem appears "529  034" & below "U625" & further down it looks like "43". I hope this means something to you.






Roy Johnson

Hello Keith,

Thank you for the photographs.  I see that my initial reply was based on a slight misunderstanding, that the writing was on the base (= valve holder) in the unit.

The writing on the base is quite visible with your clear photograph and has just repeated that visible on the glass stem.  Usually, of course,  that is not the vale type, unfortunately.  

Assuming that the valve is the correct/original, we can try to match it physically against ones we have to hand.  I shall look at likely types. 

Hopefully someone has a circuit.  So perhaps you can request this from the model page?  This gives you the best chance of a reply.

Best regards,


John Turrill


as has already been said, no record of a U625 seems
to exist; however, I have a friend who possesses  a
Lissen eliminator which is fitted with a U650.
This is listed as a half-wave rectifier, with a filament
needing  6v at 500 m/A, and capable of 400v 40 m/A
This chap would part with the valve from the unit; or
he also has a new one he'd sell.
I you're interested email me direct and I'll put you in
touch. (he's quite knowledgable)
Incidentally, Lissen DID make valves during the '30's.
Hope this is of use.
                 John Turrill.
Keith Staines

Thanks Roy & John for your replies, & for your kind offer John.

I must admit I bought the unit simply because it had an attractive Bakelite case. I am not sure if it should be restored, it is nice to have examples that have original components. Also I would prefer to use a more modern better designed power supply for use with radios from my collection. However a contemporary unit always looks much better than a new device. A dilemma I can never satisfactorily resolve.

Restored or not it would still be good to discover what the original components should be, so I have re-checked what I can. The insulation within the unit is crumbling so I did not wish to connect it to the mains. Instead I supplied it with 24 Volts AC, one tenth of normal 240V mains (UK). With the rectifier removed the off-load voltage for the heater was measured as 0.64V & the HT winding 20V. So the valve heater should definitely be 6 volts. I then connected the heater to a 6V supply & measured the current which was 500mA. So the U650 does seem to be right or at least suitable.



Roy Johnson

Dear All,

I have now entered the U625 as a Lissen valve.

My reasons for accepting it are:-

1.  That I have looked at several Lissen valves - U650, PT611, P220, HL2.    The structure of the anodes and the methods of crimping are identical in all and also match those in Keith's U625.   This valve is therefore from the same source.

2.  Examination of the U650 and PT611 show each of the valve types marked in an identical manner and in the same place on the stem as on the U625.

John, my reasons of doubting the manufacture by Lissen may be unjust and I would greatly appreciate any information that you have as I am trying to explore the history, having a personal connection.    Lissen was based in Richmond, Surrey where I also happened to have an evening job at the Institute teaching radio and TV servicing for the City and Guilds examinations in the 1950s.   A gentleman approached me as he was looking for information on good students for his repair shop.   In discussion, he told me that he has worked for Lissen in the 1930s and later gave me some valves including several Lissen.  He also said that Lissen never manufactured valves themselves but contracted this work out or bought them in.

(The only other valve that I have so far found having a similar structure, is a "Power" by Emston.   I have no details of this brand, but the similarity to the Lissen seems to indicate the same source.  Again, I would greatly appreciate any information.)

It is documented in J W Stokes book that Lissen used redundant BTH stock and also bought in from other sources.    Stokes also comments that it is "likely" that they were making their own during 1930 to 1934.    But there is no proof and I would welcome any accurate information as firm evidence is in very short supply!

Stokes also comments on the Lissen eliminators and states that the rectifiers used were actually triodes with the anode strapped to the grid.    My U650 certainly has no grid and neither does the U625, so either Stokes is wrong or these were not the valves used in all the eliminators.

As a general tip - all my Lissen valves have almost unreadable legends on the glass top.  The normal trick of breathing on them helps but it is a good idea to put the valve in a refridgerator freezing box for a few minutes.  The legend is then clearly readable for long enough to examine and read! 

Best regards and apologies for the delay,



Keith Staines
Dear All,
Apologies for the late reply, I have been away for some time.
Having been told where to expect to find the manufacturers legends, I have re inspected the valve more closely.
Whilst examining the valve in the early morning I discovered that holding the glass at a very critical angle against direct sunlight (low on horizon, slightly orange) the top legend was just visible. The clarity diminished as the sun rose, I double checked & found the legend wasn’t visible in artificial light! Anyway the result is that I can now say that the valve is marked:-
Although the L in Lissen was almost missing & looked more like a T.
Sorry I wasn’t able to supply this info before now. Thanks again for all the help provided.
Best regards,
Michael Watterson

My information was that they bought wire ended valves and fitted their own bases. So manufacture of a sort. Later these were Mullard (or Philips as Mullard owned by Philips from 1928). Some may have been Mazda.
Ever Ready controlled Lissen from 1928 and put in their own manager from 1934. Later Ever Ready branded valves. Some may have been purchased by Pye from 1935 as from 1935 to 1938, Pye was involved with Ever Ready / Lissen.

There were several UK companies from late 1920s buying and rebranding valves. It's not clear of some were untested or wiithout bases to get more discount.

Lissen Ltd.; London: Popular Model A-C Eliminator Type B
End of forum contributions about this model