Mystery Tube Amplifier -- Help????? - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 7th December 2008, 05:30 PM   #11
poynton is offline poynton  United Kingdom
diyAudio Member
 
poynton's Avatar
 
Join Date: Mar 2005
Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)
It's not a Quad 1 - different layout and tubes.

The transformers remind me of the old RCA amp.

From the resistors, I would say late '40s or early '50s.

Andy
__________________
If it ain't broke, break it !! Then fix it again. It's called DIY !
  Reply With Quote
Old 7th December 2008, 05:35 PM   #12
diyAudio Member
 
Alastair E's Avatar
 
Join Date: Feb 2004
Location: South Wales
Looks like it could be an old cinema Monitor amp, from the chassis colour, prob. Gaumont-Kalee
__________________
Das Beste Oder Nichts
  Reply With Quote
Old 9th December 2008, 04:24 PM   #13
poynton is offline poynton  United Kingdom
diyAudio Member
 
poynton's Avatar
 
Join Date: Mar 2005
Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)
Someone must know what this is.

I know I've seen it somewhere before - probably at an audiojumble.

Andy
__________________
If it ain't broke, break it !! Then fix it again. It's called DIY !
  Reply With Quote
Old 10th December 2008, 03:03 AM   #14
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi Andy,
Can you show up pictures from the top and front? That might trigger someone's memory, even if it's marked up.

Things you know:

The approximate age
The tube compliment
Possibly the make of the transformers.
The rough circuit configuration and power output.

From that, you might be able to track down the OEM, or brand. Most manufacturers find a way to do things and don't stray from that too often. There is also a post on the rear panel to select some mode of operation or output impedance. That looks a lot like what I have seen on the small Leak stereo amp I have that uses 6BQ5s. Okay, they are EL84s.

Anyway, you may find it by cruising through schematics of that era.

-Chris
__________________
"Just because you can, doesn't mean you should" my Wife
  Reply With Quote
Old 10th December 2008, 05:18 PM   #15
Gooch is offline Gooch  United States
diyAudio Member
 
Gooch's Avatar
 
Join Date: Aug 2005
Location: West Coast of Florida
Looks like an old Heath kit.
  Reply With Quote
Old 10th December 2008, 05:41 PM   #16
diyAudio Member
 
richwalters's Avatar
 
Join Date: Sep 2003
Location: Alps:Tube amp designs over 150W, SMPS guru.
My guess it's an old Bell & Howell amp from an old Cine projector. 15Watts is the absolute limit. It's certaintly not a Radford, as the layout is cramped tight. Radfords get V. hot and sound poor.
Judging from your comments, the front panel has been added and perhaps camuflagued the entire amp. B&H didn't use any special amp design.
Beware: these early amps often used an uninsulated AC/ DC chassis; ie common practise that the line plug HAD to be wired the correct way to avoid electric shock. Bell and Howell at the time i.e 1950's were high quality manufacturers so they would have used the standard mains isolating transformer, but even so do the checks first.
I've come across many vintage amps modified with total neglect to high voltage safety and users unaware of this.

richj
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mystery amplifier ... no clue? lineup Solid State 4 6th September 2008 09:45 AM
Mystery tube in a Fisher FM-90X - V50,064 john q. bebop Tubes / Valves 9 8th April 2008 06:26 AM
Differential amplifier mystery? klitgt Digital Source 0 7th March 2006 02:07 PM
Help! Mystery tube (?) amp (type: HK56) edl Tubes / Valves 0 19th January 2005 05:34 PM
Mystery Amplifier - check it out lgreen Solid State 16 13th January 2005 02:51 AM


New To Site? Need Help?

All times are GMT. The time now is 10:17 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2