Help - tube radio - Page 4

bournville · 26th February 2003, 08:12 PM

Hmm..

I think that the ECL86 is the right valve for the audio stage - if you look at some of the other components, such as the IF transformers, these are also smaller (and probably more modern) than you see on late 50s/early 60s valve jobs which would place this one mid to late 60s. By this time ECL82s had been superceded.

As to finding a schematic, if this set was an export model (it is a large chassis for so few components) designed for specific markets, perhaps originally a console model, a schematic might be hard to track down.

planet10 · 26th February 2003, 08:52 PM

Quote:

Originally posted by bournville
I think that the ECL86 is the right valve for the audio stage - if you look at some of the other components, such as the IF transformers, these are also smaller (and probably more modern) than you see on late 50s/early 60s valve jobs which would place this one mid to late 60s. By this time ECL82s had been superceded.

As to finding a schematic, if this set was an export model (it is a large chassis for so few components) designed for specific markets, perhaps originally a console model, a schematic might be hard to track down.

ECL86 is a triode/pentode, a self contained SE power amp. The ECL82=6BM8 has been superceeded?

Actually if you can find any schematic for something similar it would probably give you a good idea of what is happening.

Birmingham? -- i was just talking to a buddy of mine (from here) that plays LooseHead for Birmingham.

dave

bournville · 26th February 2003, 09:29 PM

I've had a quick check through my schematics, but I have nothing for Pilot after about 1963 - possibly the brand name went into disuse in the UK, the sets being released under another name.

As regards the ECL82, its just that by the mid-1960s UK manufacturers were preferring the ECL86 for output stages in radio and gram applications, and in pp circuits also. I think the ECL82 is a good workmanlike tube, I still got a few and one or two small amps using them in pp.

Er... what's a Loosehead?

planet10 · 26th February 2003, 09:42 PM

6BM8 was very popular with the Japanese, i haven't seen it in any European amps, and only a few US amps.

Quote:

Originally posted by bournville
Er... what's a Loosehead?

Guess that means you aren't a Rugby guy... Loosehead Prop, one of the guys on the front row in the scrum.

dave

bournville · 26th February 2003, 09:59 PM

Dave,

I'm surprised by that - the ECL82/6BM8 was a popular choice for the output stages in UK made radios in the latter 1950s/early 1960s. I've come across them on many occasions. Also a popular choice for single tube record player amps, in hybrids sometimes using the pentode's cathode bias resistor to develop a voltage to supply a transistorised AM tuner.

So... thats what a loosehead is, and I was made (forced!) to play rugby at school. Edyerkation aint what it used to be!

planet10 · 26th February 2003, 10:49 PM

Quote:

Originally posted by bournville
I'm surprised by that - the ECL82/6BM8 was a popular choice for the output stages in UK made radios

Could because i haven't had too many UK built vintage stuff thru here... mostly German.

dave

dhaen · 26th February 2003, 11:52 PM

Time to be bored to death

As far as I can remember, the P/ECL83 was the first to go out of favour with the designers, then the P/ECL82.
The P/ECL86 was the last of the triode/pentodes with this nomenclature.
In the UK another nomenclature was also used for a parallel (though not equivalent in any sense) family of triode/pentodes:
30PL12, 30PL13, 30PL14 come to mind. The first number might be wrong, or different - it referred to the heater voltage or current.

There's more where that came from

Cheers,

bournville · 27th February 2003, 10:17 AM

Dhaen,

I think you're right, we don't need to pursue the development of the whole series of triode pentodes, otherwise we'll end up with the universal series also, the UCL82, UCL83 (but not a UCL86, at least, I've never seen one)!

What might be more useful is if anyone knows if Pilot radios were released in the UK under another brand name by the latter 1960s, because then we might be able to track down a schematic for DJev.

fdegrove · 27th February 2003, 10:43 AM

Hi,

Maybe this helps:

PILOT

Cheers,

EC8010 · 27th February 2003, 11:24 AM

Well, I had a look, and they all look too early. Not a hint of European valve codes. Perhaps there were two Pilots?

26th February 2003, 11:52 PM	#37
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Obsolessence Time to be bored to death As far as I can remember, the P/ECL83 was the first to go out of favour with the designers, then the P/ECL82. The P/ECL86 was the last of the triode/pentodes with this nomenclature. In the UK another nomenclature was also used for a parallel (though not equivalent in any sense) family of triode/pentodes: 30PL12, 30PL13, 30PL14 come to mind. The first number might be wrong, or different - it referred to the heater voltage or current. There's more where that came from Cheers,

27th February 2003, 10:17 AM	#38
bournville diyAudio Member Join Date: Feb 2003 Location: Birmingham, UK	lovely old triode pentodes Dhaen, I think you're right, we don't need to pursue the development of the whole series of triode pentodes, otherwise we'll end up with the universal series also, the UCL82, UCL83 (but not a UCL86, at least, I've never seen one)! What might be more useful is if anyone knows if Pilot radios were released in the UK under another brand name by the latter 1960s, because then we might be able to track down a schematic for DJev.

27th February 2003, 10:43 AM	#39
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	PILOT RADIO. Hi, Maybe this helps: PILOT Cheers, __________________ Frank

27th February 2003, 11:24 AM	#40
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	Well, I had a look, and they all look too early. Not a hint of European valve codes. Perhaps there were two Pilots? __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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26th February 2003, 08:12 PM	#31
bournville diyAudio Member Join Date: Feb 2003 Location: Birmingham, UK	Hmm.. I think that the ECL86 is the right valve for the audio stage - if you look at some of the other components, such as the IF transformers, these are also smaller (and probably more modern) than you see on late 50s/early 60s valve jobs which would place this one mid to late 60s. By this time ECL82s had been superceded. As to finding a schematic, if this set was an export model (it is a large chassis for so few components) designed for specific markets, perhaps originally a console model, a schematic might be hard to track down.

26th February 2003, 09:29 PM	#33
bournville diyAudio Member Join Date: Feb 2003 Location: Birmingham, UK	I've had a quick check through my schematics, but I have nothing for Pilot after about 1963 - possibly the brand name went into disuse in the UK, the sets being released under another name. As regards the ECL82, its just that by the mid-1960s UK manufacturers were preferring the ECL86 for output stages in radio and gram applications, and in pp circuits also. I think the ECL82 is a good workmanlike tube, I still got a few and one or two small amps using them in pp. Er... what's a Loosehead?

26th February 2003, 09:59 PM	#35
bournville diyAudio Member Join Date: Feb 2003 Location: Birmingham, UK	Dave, I'm surprised by that - the ECL82/6BM8 was a popular choice for the output stages in UK made radios in the latter 1950s/early 1960s. I've come across them on many occasions. Also a popular choice for single tube record player amps, in hybrids sometimes using the pentode's cathode bias resistor to develop a voltage to supply a transistorised AM tuner. So... thats what a loosehead is, and I was made (forced!) to play rugby at school. Edyerkation aint what it used to be!

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