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 Post subject: Amplifiers
PostPosted: Sep Sat 30, 2006 11:17 pm 
What type of amplifiers do the tube radios from the 50's use?


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 Post subject:
PostPosted: Sep Sat 30, 2006 11:28 pm 
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Are you talking table radios, AA5 or large radios? May of them used 50C5, 50L6, 6AQ5, 6BQ5, 6V6 etc. operating as Class A. Is that what you are looking for?

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 Post subject:
PostPosted: Oct Sun 01, 2006 12:03 am 
I am thinking table radios like Grundigs, Telefunkens and such. How about a Grundig 5088, for instance.


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 Post subject:
PostPosted: Oct Sun 01, 2006 12:52 am 
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Most German table radios used single-ended 6BQ5/EL84s. The 5088 used push-pull EL95s for a bit more power output than most...


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 Post subject:
PostPosted: Oct Sun 01, 2006 2:08 am 
Isn't a push-pull amp a class AB and not class A?


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 Post subject:
PostPosted: Oct Sun 01, 2006 2:13 am 
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Probably is. In the post above, I was referring to single-ended radios...

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 Post subject:
PostPosted: Oct Sun 01, 2006 2:39 am 
If I see that a vintage radio of the types I described has two amplifier tubes ( say two El95s) should that clue me in that it is Push-pull? I'm asking because I've read that Class A amps are supposed have a purer tone.


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 Post subject:
PostPosted: Oct Sun 01, 2006 4:03 am 
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If there are two output tubes, it's push-pull, or stereo (OK, parallel tubes are possible, but unlikley). Push-pull stages can be run in class A, AB or B, but single ended stages can only be run class A. Most radios using push-pull will be class A.

What defines class AB is that the output tubes are cut off for part of the AC cycle. This usually requires a separate bias supply, not cathode bias.


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 Post subject:
PostPosted: Oct Sun 01, 2006 4:37 am 
What is a typical new stereo like an NAD, Class A, AB or B?


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 Post subject:
PostPosted: Oct Mon 02, 2006 1:31 am 
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With the boutique operating classes available today, you'd just about have to consult the mfg. specs.

-Ed


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 Post subject:
PostPosted: Oct Mon 02, 2006 4:36 am 
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Years ago I ran across a German stereo set that used IIRC an ECCLL800, it's a triode and a pair of power pentodes in a tall 9 pin configuration. This gave you push-pull output's and the phase inverter in one envelope. The set had one that was bad and I couldn't find a replacement so I made one using a couple of 6AQ5's and a 6C4 and wired it up on a 9 pin plug. The set worked fine and the customer was happy

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