simple guitar push pull amp - 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 August 2008, 02:50 PM   #1
dan _s is offline dan _s  Israel
diyAudio Member
 
dan _s's Avatar
 
Join Date: Feb 2003
Location: israel
Default simple guitar push pull amp

Hello all

i have a small Peavy guitar amp+speaker cabinet. i'd like to build a tube amp to replace the transistorized unit in the cabinet. i have a push pull output transformer which i could use for that

what i'm looking for is the schematics for a guitar amplifier to which i can incorporate the speaker and transformer. it may use a pair of 6550 or EL34. preferably with an option for overdrive / distortion modulation

the the transformer has primary impedance 4500ohm, secondary 8ohm. the cabinet has one driver, resistance 3ohm.

i got a referal to this webpage http://www.drtube.com/guitamp.htm it contains hundreds of circuits but there's no way to browse this list by amp specs. i'd also like recommendations for proven designs


thanks
dan
  Reply With Quote
Old 7th August 2008, 04:07 PM   #2
diyAudio Member
 
leadbelly's Avatar
 
Join Date: Dec 2002
Location: Calgary, Alberta
First of all, please identify the original thread when you cross post the same question to a different forum.

Also, I am not sure all of your requirements can be met. You have a 4.5K:8 OPT, a 3 ohm speaker, and want to use a pair of 6550's or EL34's.

If you use that transformer with a 3 ohm (let's call it 4 ohm nominal) driver, the primary impedance will be 2.25K. That's too low for 6550's or EL34's, especially if you expect to drive the output stage hard for a dirty sound.

So, what do you want to compromise? If you must use that transformer, you should either pick a different tube to use, or maybe use a quartet of lower power tubes (e.g. EL84's or 6V6's). Or do you insist on your tube choice and want to buy a different transformer?
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari
  Reply With Quote
Old 7th August 2008, 05:00 PM   #3
dan _s is offline dan _s  Israel
diyAudio Member
 
dan _s's Avatar
 
Join Date: Feb 2003
Location: israel
i didn't i would make a difference, my first post on this matter in this BB system was here

what i have in hand is the OP transformer (a pair in fact) and the driver in the cabinet. i don't care which tube to use as long as it's electrically suitable and easy to find and buy
i also bare in mind the possibility that the what i have may not fit together
  Reply With Quote
Old 7th August 2008, 07:44 PM   #4
diyAudio Member
 
leadbelly's Avatar
 
Join Date: Dec 2002
Location: Calgary, Alberta
Well, frankly, because there are so many choices out there, I'll have to move into subjective & personal opinions.

You want a proven design. To me that says clone a classic amp and stay away from the AX84 ilk (I know I may be spammed for this). For that OPT, you can build a Vox AC30 clone with a quad of EL84's or a Fender variation with a quad of 6V6's. If you are thinking practice amp those are too much power so use a quad of 6K6's.
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari
  Reply With Quote
Old 10th August 2008, 12:25 PM   #5
dan _s is offline dan _s  Israel
diyAudio Member
 
dan _s's Avatar
 
Join Date: Feb 2003
Location: israel
Thanks!
  Reply With Quote
Old 10th August 2008, 12:44 PM   #6
diyAudio Moderator Emeritus
 
ray_moth's Avatar
 
Join Date: Jan 2004
Location: Jakarta
Leadbelllly's advice makes good sense.

Quote:
Leadbelly": I know I may be spammed for this
I hate to disappoint: SPAM!
  Reply With Quote
Old 11th August 2008, 07:03 PM   #7
Merlinb is offline Merlinb  United Kingdom
diyAudio Member
 
Merlinb's Avatar
 
Join Date: May 2006
Location: Lancashire
Quote:
Originally posted by leadbelly
stay away from the AX84 ilk
Why? Surely a guitar-amp dedicated website is exactly the place to hang around, if you're into that sort of thing...
  Reply With Quote
Old 11th August 2008, 10:10 PM   #8
diyAudio Member
 
Join Date: Jun 2004
Location: Indiana
I got a lot of very good help from the AX84 guys on my build. I ended up using their preamp schematics to develop mine. I used a 6V6 18Watt style output though.
__________________
If We The People refuse to hear the truth we will be ruled by liars.
  Reply With Quote
Old 12th August 2008, 01:02 AM   #9
diyAudio Member
 
leadbelly's Avatar
 
Join Date: Dec 2002
Location: Calgary, Alberta
Quote:
Originally posted by Merlinb
Why? Surely a guitar-amp dedicated website is exactly the place to hang around, if you're into that sort of thing...
I guess the spamming is starting I was referring to designs of that ilk. He wanted a proven design so I told him to clone a classic amp rather than build a DIY design that few people have built.
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari
  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
6v6 push pull guitar amp schematic sought guitar_joe Tubes / Valves 40 12th April 2013 06:26 AM
50c5 push-pull for guitar? freefallingegg Tubes / Valves 33 18th October 2010 09:27 PM
Guitar amp, push pull dan _s Instruments and Amps 4 8th August 2008 09:26 AM
simple 6v6 push-pull schematic ? vlljpior Tubes / Valves 6 30th November 2004 08:13 PM
A very simple push-pull project darkfenriz Solid State 5 6th September 2004 09:26 AM


New To Site? Need Help?

All times are GMT. The time now is 02:36 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