Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

Is this old valve amp any good ?
Is this old valve amp any good ?
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 23rd May 2020, 10:08 AM   #1
TheFinisher is offline TheFinisher  United Kingdom
diyAudio Member
 
TheFinisher's Avatar
 
Join Date: May 2019
Location: Milton Keynes
Default Is this old valve amp any good ?

Would this be of any use to someone on here ? Maybe the parts ?

IMG_4419.jpg

IMG_4415.jpg
IMG_4416.jpg
IMG_4417.jpg
IMG_4418.jpg
Attachment 1
Attached Images
File Type: jpg IMG_4414.jpg (355.0 KB, 524 views)
  Reply With Quote
Old 23rd May 2020, 10:50 AM   #2
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
Is this old valve amp any good ?
other than the outside of its chassis - it looks first class and those blue caps aren't "terribly old". It should be a solid foundation for a nice mono setup.

Dust the transformers off, use a "rust reformer" then paint them.
  Reply With Quote
Old 23rd May 2020, 11:22 AM   #3
Galu is offline Galu  Scotland
diyAudio Member
 
Join Date: Apr 2018
Looks like its based on the Mullard 5-20 circuit with an extra pre-amplification stage.

It's in need of knowledgeable renovation, particularly in terms of bringing it up to modern safety standards.

Good for 20 watts and I'm sure there's lots of 'valve heads' who would be eager to get their hands on it!
  Reply With Quote
Old 23rd May 2020, 11:31 AM   #4
TheFinisher is offline TheFinisher  United Kingdom
diyAudio Member
 
TheFinisher's Avatar
 
Join Date: May 2019
Location: Milton Keynes
I think itís a Grampian 562a PA/guitar amp .
20 watts.
  Reply With Quote
Old 23rd May 2020, 11:45 AM   #5
Galu is offline Galu  Scotland
diyAudio Member
 
Join Date: Apr 2018
Well spotted!

Definitely a Grampian, but with an extra EF86 to the usual 562a circuit.

The one shown in the link below uses 6L6 output valves.

562A Ampl/Mixer Grampian Reproducers Ltd.; Middlesex, build
  Reply With Quote
Old 23rd May 2020, 11:55 AM   #6
Galu is offline Galu  Scotland
diyAudio Member
 
Join Date: Apr 2018
Below is a link which more clearly shows the standard 562A layout and valve complement for comparison.

Seems that you may have a different (and perhaps rarer) model.

Grampian 562A vintage valve PA amplifier. Free data sheet by GB Audio
  Reply With Quote
Old 23rd May 2020, 12:11 PM   #7
TheFinisher is offline TheFinisher  United Kingdom
diyAudio Member
 
TheFinisher's Avatar
 
Join Date: May 2019
Location: Milton Keynes
Quote:
Originally Posted by Galu View Post
Below is a link which more clearly shows the standard 562A layout and valve complement for comparison.

Seems that you may have a different (and perhaps rarer) model.

Grampian 562A vintage valve PA amplifier. Free data sheet by GB Audio

Thanks Galu Is this old valve amp any good ?
  Reply With Quote
Old 23rd May 2020, 02:11 PM   #8
Schmitz77 is offline Schmitz77  Germany
diyAudio Member
 
Join Date: Apr 2015
And it has extra input trannie, which is excellent.
This is a classic EL34 push- pull power amp with excellent parts and crafted with real workmanship. Finished in hammered silver gray colour.

It the trannies are working, the rest could be restored and needs a new paint job. Ready to rumble for the next fifty years.
Someone has already exchanged some caps for new ones. So the pricey part is done. Check the circuit for correct voltages!

Last edited by Schmitz77; 23rd May 2020 at 02:14 PM.
  Reply With Quote
Old 23rd May 2020, 02:39 PM   #9
Galu is offline Galu  Scotland
diyAudio Member
 
Join Date: Apr 2018
The input transformer would have been included to support the use of a moving coil microphone for public address purposes.

Possibly the early Grampian MCR! MCR Microphone/PU Grampian Reproducers Ltd.; Middlesex, buil
  Reply With Quote
Old 23rd May 2020, 02:48 PM   #10
poynton is offline poynton  United Kingdom
diyAudio Member
 
poynton's Avatar
 
Join Date: Mar 2005
Location: UK
It's probably worth £200+ as is.


.
__________________
If it ain't broke, break it !! Then fix it again. It's called DIY !
  Reply With Quote

Reply


Is this old valve amp any good ?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Digital source and valve amp combo. Good or bad set up? matt scarlett Digital Source 17 18th May 2015 06:11 PM
Good valve design calculator website nigelwright7557 Tubes / Valves 1 20th July 2014 04:09 AM
Hyperx soft start any good for valve amp situation? data Tubes / Valves 0 25th September 2011 07:33 PM
Looking for a good valve preamp AndreaVTS Tubes / Valves 8 23rd October 2009 06:56 PM
looking for a good valve amp to fix baldaly Tubes / Valves 0 26th October 2004 08:49 PM


New To Site? Need Help?

All times are GMT. The time now is 12:47 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki