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

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Old 21st Jun 2017, 8:20 pm   #1
SgtSTiGLiTZ
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Default Help! Can any of you buffs identify this amplifier?

I have a chance of this little old amplifier, but before I commit I would like to try and find out just what exactly it is
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Old 21st Jun 2017, 8:59 pm   #2
Edward Huggins
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Default Re: Help! Can any of you buffs identify this amplifier?

Regret, I've no idea. A home-brew mono amp from the early to mid 1950s? They look like octal valve holders, so maybe a 6V6 Push Pull amp? I recognise the Bulgin pointer knobs and the control plates behind them, very much of the period. What would you intend to do with it?
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Old 21st Jun 2017, 9:02 pm   #3
paulsherwin
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Default Re: Help! Can any of you buffs identify this amplifier?

It could be from a factory or school. The transformer arrangements look a bit odd.
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Old 21st Jun 2017, 9:08 pm   #4
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Default Re: Help! Can any of you buffs identify this amplifier?

Much modified or a bitsa,, control escutcheons are of the type used by Grampian as is the 3 pin input socket and what looks like a disused mains selector panel.

See here:

http://www.gbaudio.co.uk/data/grampian.htm

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Old 21st Jun 2017, 11:35 pm   #5
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Default Re: Help! Can any of you buffs identify this amplifier?

Thanks for the information, im thinking of restoring it to its former glory, but I'm a Vintage Radio Virgin lol, I've become a little rusty with my electronics skills but intend to revamp them and steer away from the modern PC repairs as there is just no joy in the end result

Thanks again.. Vaughan
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Old 21st Jun 2017, 11:40 pm   #6
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Default Re: Help! Can any of you buffs identify this amplifier?

Reminds me of a Grampian I might have seen back in the 60s as well - but that might be a very misty memory!
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Old 21st Jun 2017, 11:56 pm   #7
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Default Re: Help! Can any of you buffs identify this amplifier?

Quote:
Originally Posted by SgtSTiGLiTZ View Post
Thanks for the information, im thinking of restoring it to its former glory, but I'm a Vintage Radio Virgin lol, I've become a little rusty with my electronics skills but intend to revamp them and steer away from the modern PC repairs as there is just no joy in the end result

Thanks again.. Vaughan
I don't think this would make a good first project. It's a bit of an unknown quantity, and besides, what would you do with an early 50s mono PA amp anyway? The standard advice applies: go for a mid 50s wooden LW/MW/SW 4 valve + rectifier radio with a mains transformer. We will all understand what you're working on then and will be able to give advice.
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Old 22nd Jun 2017, 3:32 am   #8
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Default Re: Help! Can any of you buffs identify this amplifier?

It seems to have been repainted without much skill, so would need stripping down anyway.
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Old 22nd Jun 2017, 8:58 am   #9
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Default Re: Help! Can any of you buffs identify this amplifier?

I also have a Grampian with those red dials, the knobs and the same mains pilot light, in the same colour, but with a barrier strip at the rear. A cage lid goes over the top. Not exactly conclusive I admit
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Old 22nd Jun 2017, 9:20 am   #10
Peter.N.
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Default Re: Help! Can any of you buffs identify this amplifier?

I think Vortexion used similar knobs and surrounds.

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Old 22nd Jun 2017, 9:28 am   #11
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Default Re: Help! Can any of you buffs identify this amplifier?

RCS kit perhaps?
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Old 22nd Jun 2017, 11:11 am   #12
Edward Huggins
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Default Re: Help! Can any of you buffs identify this amplifier?

Whilst RSC Kits did have 4 controls at the front, I don't recognise this as being one of theirs. Please do not take any offence, but this does seem a rather dubious project as it is unlikely that you will be able to trace any circuit diagram for it. Maybe much more rewarding for you to build/re-build a Mullard 3-3, 5-10 or 5-20 amplifier if you are just looking to have a Mono Hi Fi.
A
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Old 22nd Jun 2017, 11:11 am   #13
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Default Re: Help! Can any of you buffs identify this amplifier?

Quote:
Originally Posted by lesmw0sec View Post
RCS kit perhaps?
That was my first thought.
It certainly appears to have been modified, whatever it is.
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Old 22nd Jun 2017, 5:10 pm   #14
SgtSTiGLiTZ
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Default Re: Help! Can any of you buffs identify this amplifier?

Hello guys, thanks again. I will use this information.to do some googling. I have been looking at the valves and found 2x KT66 and a 5U4 HT rectifier if this helps.
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Old 23rd Jun 2017, 7:56 pm   #15
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Default Re: Help! Can any of you buffs identify this amplifier?

Hi Vaughan, do you know which valves are meant to be fitted? That may help to decide which type it is. These seems to be plenty of iron in the transformers, always a good sign.
If you are stuck I may have some used valves that would do and I'm not too far away.

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Old 23rd Jun 2017, 8:24 pm   #16
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Default Re: Help! Can any of you buffs identify this amplifier?

Is it a Trix ?
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Old 24th Jun 2017, 2:44 am   #17
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Default Re: Help! Can any of you buffs identify this amplifier?

Can you post a few photos of underside layout and parts?
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Old 28th Jun 2017, 6:16 pm   #18
SgtSTiGLiTZ
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Default Re: Help! Can any of you buffs identify this amplifier?

Hello guys, sorry for being so silent over the last week, I have been a little on the busy side, anyhoo heres a photo of the guts from the underside, hope this makes sense. Thanks again, Vaughan
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Old 28th Jun 2017, 6:41 pm   #19
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Default Re: Help! Can any of you buffs identify this amplifier?

And the output valves, the other 2 are 6J7 one as amplifier and one connected as triode driver with a transformer phase splitter.
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Old 29th Jun 2017, 12:22 pm   #20
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Default Re: Help! Can any of you buffs identify this amplifier?

Have you acquired it yet? Those output valves on their own if in good condition electrically are worth a fair bit (probably north of £50 each).


The amp would be rated for around 30W, probably.
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