EL34 Valve In A Radio

[bobhowe]

Hi did any radios use an EL34 in a radio ? if so what make and model kind regards Bob

[ppppenguin]

The EL34 was introduced in 1952: http://www.r-type.org/exhib/aaa0014.htm tough this page suggests 1954: http://www.r-type.org/exhib/aad0111.htm

In either case, I doubt if a radio designer would have wanted or needed this sort of power output. The EL84 would have been more than adequate. It's possible that high quality radiograms would have used a pair of EL34 in push-pull.

[bobhowe]

HI Jeffery I have a Pye Mozart HFS 10 amplifier 10WPC single ended with is unusual having only 10Watts using EL34 s and if Pye did this wonder if anyone used these in a radio as well kind regards Bob

[Paul_RK]

Radiomuseum.org lists a great many standalone amplifiers with the EL34, but not much else - a couple of Alba stereograms from the mid '60s , the 9904 Viscount and 9905 Viking, are listed there as having single-ended EL34 output. No pictures and I imagine they were quite rare beasts, Alba made occasional excur5sions into higher-end domestic equipment but didn't exactly have a name for it.

Paul

[Geordie McBoyne]

I was surprised to learn that the EL34 was first introduced in 1949. A development of the rare EL60 which had a B9G base. MO valve company came up with their version of the EL34, the KT77.
The Mullard EL37 is similar. https://www.radiomuseum.org/tubes/tube_el37.html
Before WW2 Mullard developed a similar valve the AL60 which has the old B7 base and a 4volt heater. More than ten years ago the AL60 or CV9 could be bought for a few pounds but the Audiophools discovered it and now, like many other audio power valves commands a high price.
https://www.radiomuseum.org/tubes/tube_al60.html
Never seen the Alba radiogram with the single EL34 in the output stage.

The Pye Mozart delivers 10watts with a total harmonic distortion of 0.3 per cent @ 1Kc/s. Has three negative feedback loops.

Geordie McBoyne.

[radioman]

I've got some EL35 valves which were out a few years earlier than the EL34.
Yup, 1945 : http://www.r-type.org/exhib/aad0117.htm
Nothing which uses them though...

Andy

[bobhowe]

I was surprised to learn that the EL34 was first introduced in 1949.  A development of the rare EL60 which had a B9G base. MO valve company came up with their version of the EL34, the KT77.                                           
  The Mullard EL37 is similar. https://www.radiomuseum.org/tubes/tube_el37.html
Before WW2 Mullard developed a similar valve the AL60 which has the old B7 base and a 4volt heater. More than ten years ago the AL60 or CV9 could be bought for a few pounds but  the Audiophools discovered it and now, like many other audio power valves commands a high price.
https://www.radiomuseum.org/tubes/tube_al60.html
Never seen the Alba radiogram with the single EL34 in the output stage.

The Pye Mozart delivers 10watts with a total harmonic distortion of 0.3 per cent @ 1Kc/s. Has three negative feedback loops.

Geordie McBoyne.

Hi the Pye Mozart is truly a well build British engineered amplifier and it sounds as good as it looks . I see the EL37 with the ST shape bulb are Audiophools money as well . Got a Mullard EL34 with the date code XF1 June 1951 made in the Philips Sittard factory in Holland ? what radio could be modified to use this valve ? kind regards Bob

[Murphyv310]

Hi Bob.
You have to be careful when replacing a valve with one that has higher heater current. You could stress the mains transformer on the heater side but also could stress the same transformer due to higher HT current and possibly the rectifier and output transformer. What is the real point? A few extra watts to blow your ears to kingdom come!

[Geordie McBoyne]

In the mid-sixties Brimar introduced a new audio output valve, the EL506. Similar to the American 7868. About the same time Brimar developed a new double triode, the ECC807.

http://www.r-type.org/exhib/abv0001.htm

Geordie McBoyne.

[bobhowe]

Hi David that's a powerful valve for it size this will command audiophools prices kind regards Bob