Newbie question about a 300B amplifier - 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 16th April 2011, 06:17 AM   #1
rss388 is offline rss388  United States
diyAudio Member
 
Join Date: Dec 2007
Default Newbie question about a 300B amplifier

Hi all,

I was in China recently and on a whim, I bought a display unit of a 300B amplifier. When I brought it back, the tubes were taken out and packed separately. Now I have a problem, not knowing which tubes to put back where. The amp has a 5Z3P rectifier and two 300B tubes, which I was able to locate on the unit as labelled. Now comes the problem, the other 4 sockets have the same number of pins for two tube types but I am not sure about the labelling. Two of the tubes are dark coated and one had printed on it 6P6P and the other two are clear but no markings. I attach a couple of pictures of the unit. I can trace that the input signals go to the center tubes rather than the side ones immediately next to the 300B tubes. Do I have it right as in the picture or should I put the dark 6P6P tube in the middle and the two clear tube on the sides? Sorry for this newbie question. I feel so stupid. I did verify the unit was working before taking the tubes out. Your help much appreciates!
Attached Images
File Type: jpg IMG00154-20110414-0816.jpg (292.2 KB, 112 views)
File Type: jpg IMG00155-20110414-0817.jpg (222.9 KB, 105 views)
File Type: jpg IMG00156-20110414-0817.jpg (217.0 KB, 99 views)
  Reply With Quote
Old 16th April 2011, 11:55 AM   #2
diyAudio Member
 
azazello's Avatar
 
Join Date: Aug 2008
Location: Bulgaria
I don't know the schematic, but left picture is maybe right.
Central tubes are: 1 rectifier /big one/ and two clear tubes are maybe for stability
/they look like the same Russian СГ-4 for stability of U/.
/sorry for my bad English....!/
Can You make photo of back side, it's important to look the difference between 4 sockets?

Last edited by azazello; 16th April 2011 at 11:58 AM.
  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
ArnoldC's IT coupled 300B amplifier arnoldc Tubes / Valves 59 12th November 2007 10:57 PM
Newbie building d3A DRD 300B stefanolo Tubes / Valves 8 3rd February 2007 02:51 PM
Tube amplifier 300b proyect chile_willys Tubes / Valves 15 1st June 2004 10:09 PM
For Sale - 300B SE Amplifier ThorstenL Swap Meet 0 26th June 2003 07:37 PM
newbie post, but hopefully not a newbie question wiredcur Solid State 3 24th August 2002 10:49 PM


New To Site? Need Help?

All times are GMT. The time now is 08:53 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