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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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26th Aug 2017, 8:56 am | #1 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,081
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Is this a homebrew amplifier..?
I have been asked by a friend to have a stab at identifying this inherited assembly..could anyone assist please.
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26th Aug 2017, 9:02 am | #2 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Is this a homebrew amplifier..?
PSU and audio output for a comms receiver ?
The tag strip numbers = R1155 receiver's Jones plug connection numbers. Lawrence. Last edited by ms660; 26th Aug 2017 at 9:16 am. |
26th Aug 2017, 9:22 am | #3 |
Octode
Join Date: Jul 2009
Location: Carmel, Llannerchymedd, Anglesey, UK.
Posts: 1,498
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Re: Is this a homebrew amplifier..?
Certainly looks home made to me!
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26th Aug 2017, 9:30 am | #4 |
Dekatron
Join Date: Jul 2008
Location: Kington, Herefordshire, UK.
Posts: 3,657
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Re: Is this a homebrew amplifier..?
Agreed.
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26th Aug 2017, 9:33 am | #5 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Is this a homebrew amplifier..?
R1155:
3 = LT+...Chassis pic..6.3v + 4 = LT - & Earth...Ditto..Earth 8 = HT-...Ditto..-30v 5 = HT+...Ditto..HT+ 6 = Phones...Ditto..Audio Lawrence. Last edited by ms660; 26th Aug 2017 at 9:37 am. Reason: clarification |
26th Aug 2017, 9:36 am | #6 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,799
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Re: Is this a homebrew amplifier..?
The power transformer is a lot bigger than needed considering the output transformer.
Considering Lawrence's interpretation of the tag numbering, it may well be a homebrew lump to power and add a speaker amp to an 1155. David
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26th Aug 2017, 10:08 am | #7 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,385
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Re: Is this a homebrew amplifier..?
Interesting priorities- an empty tag has been left either side of the HT for clearance, yet the connection strip has been left exposed on the outside of the chassis!
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26th Aug 2017, 11:49 am | #8 |
Heptode
Join Date: Apr 2011
Location: Edinburgh, UK.
Posts: 805
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Re: Is this a homebrew amplifier..?
You won't touch it with your finger twice.
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26th Aug 2017, 12:30 pm | #9 |
Dekatron
Join Date: Jan 2006
Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex.
Posts: 5,814
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Re: Is this a homebrew amplifier..?
I've got an R1155 with a somewhat rickety PSU [tatty leads going out to Jones plugs] that may be about the same size. It's fully enclosed but I suspect that overall the, definitely home-brew, box is about the same dimensions so it's TR might well be equally generous. The negative bias line might be a clue to the 1155 "floating" chassis perhaps? You used what you could salvage back in those more utilitarian days and what you had was very likely to be more than adequate!
Dave W Last edited by dave walsh; 26th Aug 2017 at 12:36 pm. |
26th Aug 2017, 1:04 pm | #10 |
Dekatron
Join Date: Sep 2011
Location: Rugeley, Staffordshire, UK.
Posts: 8,809
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Re: Is this a homebrew amplifier..?
Very much so.
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