Sound master # 34 tube amp - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs 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

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 11th January 2016, 06:09 PM   #1
diyAudio Member
 
Join Date: Jul 2010
Location: Cairo
Default Sound master # 34 tube amp

Hi everyone,

I bought a new tube amp: "Soundmaster No.34" (Convergence Corporation No. 34 Sound master Tube Amps)

Does anyone have a schematic diagram?

I am new to tube amps and would like some help since I noticed that high frequencies disappear at high volume, but sounds good at low volume. Is this normal with tube amps?

Thanks in advance.
  Reply With Quote
Old 12th January 2016, 04:48 PM   #2
diyAudio Member
 
Join Date: May 2013
Velleman, Inc. - International - Overview

Looks real similar if not a direct copy of.................
  Reply With Quote
Old 12th January 2016, 05:29 PM   #3
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Quote:
I am new to tube amps and would like some help since I noticed that high frequencies disappear at high volume, but sounds good at low volume. Is this normal with tube amps?
No. It could indicate that the volume control is too high a value so creating a low pass filter with the Miller capacitance of the next stage. This effect would be at its worst at -6dB volume - so nearly maximum assuming a log law pot.
  Reply With Quote
Old 21st January 2016, 11:21 AM   #4
diyAudio Member
 
Join Date: Jul 2010
Location: Cairo
IceFyre13th: Thanks for your reply. The chassis looks nearly the same but not the same amp. Mine is only 2 ECC82 and 2 EL34 per channel.

Last edited by Khaled011; 21st January 2016 at 11:32 AM.
  Reply With Quote
Old 21st January 2016, 11:29 AM   #5
diyAudio Member
 
Join Date: Jul 2010
Location: Cairo
Dear DF96, Mostly you are right.
But I can not confirm without having the schematic diagram. If I find one otherwise I would have to draw myself. Thanks a lot.
  Reply With Quote
Old 21st January 2016, 04:51 PM   #6
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Pretty easy to confirm even without a schematic if the volume control pot resistance is anything greater than say 100K. A quick measurement or visual inspection should confirm. Even worse if there is an input LPF in the first stage right after the volume control.
__________________
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
  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
no other source can sound better than self-recorded master tape makaiyumtony Analogue Source 79 8th October 2011 02:51 PM
Master recording in a shortest sound path makaiyumtony Analogue Source 18 26th September 2011 03:23 AM
Hipass filter to control master bias? - Why attempt to reproduce DC in a tube amp? speakerfritz Tubes / Valves 13 12th December 2010 03:23 PM
Pioneer SX-34 tube receiver gaetan8888 Swap Meet 4 21st October 2010 08:09 AM
FS 700va custom toroid transformer 4X 34-0-34 secondaries force of 1/2 Swap Meet 0 12th November 2008 06:39 PM


New To Site? Need Help?

All times are GMT. The time now is 01:54 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki