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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 16th Jul 2019, 7:39 pm   #1
ajquiksilver
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Default Valve amp identification

Hi I was wondering if you could help me. I found an old valve amplifier in a junk shop and wondered if you could help me identify it? I'd love to be able to restore it but have no idea what each wire is for what and what the knobs even do.

It turns on and left knob is power on then volume I presume. The right knob clicks into 3 positions. Not sure what this means it was used for?

Any help you could give me would be great. Even if its just some guidance on where to connect a speaker to see if it works!

Thanks,
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Old 16th Jul 2019, 7:43 pm   #2
Station X
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Default Re: Valve amp identification

That is, or was, a radio. Note the IF Transformers, tuning coils trimmer capacitors and cut out for the tuning scale.

What valves are fitted?
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Old 16th Jul 2019, 8:23 pm   #3
ms660
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Default Re: Valve amp identification

6K8G, 6K7G, 6Q7G, 6V6G....6X5G?

The tuning capacitor is missing along with the tuning mechanism and tuning scale and the audio output transformer might be missing, other bits might be missing too.

The three position switch will be the waveband switch, originally it most likely would have covered the Medium Wave band, the Long Wave band and one of the Short Wave bands.

Lawrence.
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Old 16th Jul 2019, 9:01 pm   #4
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Default Re: Valve amp identification

Basically it's only any good for parts. It WAS a radio as already stated but has been severely robbed of essential parts. As it is, the valves might be worth selling on eBay for about a fiver each.

Sorry but it's useless as it is.
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Old 17th Jul 2019, 3:11 am   #5
peter_sol
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Default Re: Valve amp identification

And there is no output transformer which would have been mounted on the speaker which is also missing.
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Old 17th Jul 2019, 8:54 am   #6
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Default Re: Valve amp identification

It looks very similar to but not exactly the same as a Cossor 464 chassis possibly a 463

Most Cossor sets of this period had the supply taps on the transformer making me think this is an export model or possibly from a gram.

Cheers

Mike T
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Old 17th Jul 2019, 4:03 pm   #7
Edward Huggins
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Default Re: Valve amp identification

For the sake of safely I would advise the OP to not attempt to plug in to the mains as it cannot work as it is. Leave well alone and sell as spares on ebay. It's not an amplifier anyway.
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Old 17th Jul 2019, 4:57 pm   #8
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Default Re: Valve amp identification

I totally agree with Sideband. It's the remains of an old radio and not worth bothering with, and is worth around a fiver for the valves and possibly the mains transformer.
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Old 17th Jul 2019, 5:17 pm   #9
paulsherwin
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Default Re: Valve amp identification

I also agree. You can clearly see the cutout in the chassis where the speaker would have fitted. It dates from the 1940s and is effectively unrestorable in its current condition.

Don't attempt to power it up, it won't work and you may get a shock.
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Old 17th Jul 2019, 5:26 pm   #10
kalee20
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Default Re: Valve amp identification

When I saw the photos, I immediately thought, "Old radio, partially complete. No tuning capacitor, but RF coils and IF transformers still there, plus (obviously) valves and mains transformer."

No use as-is, though the valves look visually OK. If heaters are intact, may be worth advertising them on eBay or whatever, couple of quid each as otherwise untested.
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Old 17th Jul 2019, 6:37 pm   #11
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Default Re: Valve amp identification

If you bought this as a valve amplifier then I am sorry to say, you were done.
I advise like the others, that you dont mess with it just try and sell for 5 as spares.

Mike
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Old 18th Jul 2019, 7:26 am   #12
snowman_al
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Default Re: Valve amp identification

Sad to say there appears to be more and more old radio chassis being sold as 'valve amplifiers' these days.

I guess a lot of traders actually do not know (being kind) what they do or do not have... It's got valves so I thought it was an amplifier?
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Old 18th Jul 2019, 9:53 am   #13
Herald1360
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Default Re: Valve amp identification

Three of the valves and the mains transformer and the chassis could be used with a quantity of new parts to make a simple low power (about 3 watts) amplifier. In addition, a new output transformer would be needed- about 15-20.

Effectively, though, a complete and working radio with a "Gram" input already has this capability and is a radio as well.

Looks like we've lost the OP though......
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