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 May 2004, 12:06 AM   #1
diyAudio Member
 
Join Date: Jan 2004
Location: malaysia
Default help with restoring amp

Hi guys,

Im new to tubes. I just bought this jewel from an auction, and now im trying to repair it. Is anyone here familiar with this model? All i know, it is Japanese made, and i need more specs on it... Thank you!!
Attached Images
File Type: jpg tube1.jpg (83.4 KB, 222 views)
  Reply With Quote
Old 7th May 2004, 12:08 AM   #2
diyAudio Member
 
Join Date: Jan 2004
Location: malaysia
another view:
Attached Images
File Type: jpg tube2.jpg (79.8 KB, 206 views)
  Reply With Quote
Old 7th May 2004, 12:09 AM   #3
diyAudio Member
 
Join Date: Jan 2004
Location: malaysia
The back view:
Attached Images
File Type: jpg tube3.jpg (59.3 KB, 204 views)
  Reply With Quote
Old 7th May 2004, 12:37 AM   #4
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
What a hoot! Are there any tubes under the chassis? I can only see one input tube on the top- surely this is a stereo amp? Solid state input stages maybe?

In any case, it will probably run about 15 watts per side.
__________________
"It is difficult to get a man to understand something, when his salary depends upon his not understanding it." Upton Sinclair
  Reply With Quote
Old 7th May 2004, 07:11 AM   #5
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by SY
What a hoot! Are there any tubes under the chassis? I can only see one input tube on the top- surely this is a stereo amp? Solid state input stages maybe?
I was counting the tubes too... my guess is that what we have is a 6BM8 PP amp with a twin triode as an additional pre-amp gain stage. 8W/channel. Honking big OPTs for 6BM8 thou.. maybe ECL86.

Skyraider, what tubes does it have?

And a photo of the underside.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 7th May 2004, 11:34 AM   #6
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Fooled me- I couldn't make out a second section in the output tubes and assumed 6BQ5 or something like that.
__________________
"It is difficult to get a man to understand something, when his salary depends upon his not understanding it." Upton Sinclair
  Reply With Quote
Old 7th May 2004, 05:10 PM   #7
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by SY
Fooled me- I couldn't make out a second section in the output tubes and assumed 6BQ5 or something like that.
I'm just guessing -- the Japanese do like the 6BM8.

I've just recently pulled a PP 6BM8 amp out of a console -- stripped it for everything but the 4 6BM8s -- one of the very few pulls i've got that works (it and an ELL80 stereo amp) -- those two amps bring the total to about 3%

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 7th May 2004, 06:09 PM   #8
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
I agree that it's a stereo amp. Knowing the tube complement would help. Obviously, a schematic would help a lot. What has me wondering are the 6 controls, perhaps volume and tone for each channel. It would seem that there are not enough active devices on top to support the controls. Speculation about "sand" under the hood seems reasonable.

I'd like to see a close up of the label on the power trafo. I'd also like to see an image from underneath.
__________________
Eli D.
  Reply With Quote
Old 7th May 2004, 06:25 PM   #9
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by Eli Duttman
What has me wondering are the 6 controls, perhaps volume and tone for each channel. It would seem that there are not enough active devices on top to support the controls.
Volume, Bass, Treble x 2 makes sense... if the big tubes are triode/pentode, then the extra voltage stage in the 12AX7 (?) would give enuff drive for the tine controls ... no silicon required (except for rectification -- and there is a good chance it is currently a stack of selinium)

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 8th May 2004, 12:56 AM   #10
diyAudio Member
 
Join Date: Jan 2004
Location: malaysia
oh,
I have bought the thing but it has not been shipped yet, i will open it up only next week when it arrives..
The six controls baffles me to..... but i dont think its hybrid amp
anyway, whats sand and selenium??

thanks
  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
Restoring B&W 2200 cliffforrest Multi-Way 23 9th June 2010 09:35 PM
Restoring old suspension rjb Multi-Way 1 23rd June 2008 03:54 AM
Upgrades and Restoring Bigred Solid State 15 21st August 2007 01:55 AM
Restoring Veneer richie00boy Everything Else 30 26th March 2007 02:38 PM
restoring a marantz 7c pchoi122 Tubes / Valves 3 23rd December 2005 12:30 AM


New To Site? Need Help?

All times are GMT. The time now is 02:40 PM.


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