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

Instruments and Amps Everything that makes music, Especially including instrument amps.

diy tube stereo guitar project done
diy tube stereo guitar project done
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 July 2017, 07:30 PM   #21
Dusk is offline Dusk  United States
diyAudio Member
 
Dusk's Avatar
 
Join Date: Jul 2003
Location: Hendrix land
Smile update

i have been using this 60/60 watt power amplifier as a test bed for different guitar pre-amps ( one is enclosed in pic) each channel put out around 60 to 65 watt rms. next i will build a tube stereo pre-amp to mate with the 60/60 monster dusk
Attached Images
File Type: jpg 20170711_135600.jpg (718.6 KB, 53 views)
File Type: jpg 20170711_135615.jpg (791.4 KB, 49 views)
File Type: jpg 20170711_135701.jpg (806.4 KB, 46 views)
  Reply With Quote
Old 12th July 2017, 03:21 PM   #22
Tubelab_com is online now Tubelab_com  United States
diyAudio Member
 
Tubelab_com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Quote:
In a PP guitar amp, slightly unmatched power tubes can sound better.....However, they shouldn't be too far off, or you......
Rewind back about 25 to 30 years. I used to fix guitar and HiFi amps. I had a friends Bandmaster on the bench for minor repairs so I tried a few simple experiments. One of them involved rather seriously mismatched tubes....a 6L6GC and an EL34. It did not explode as expected, and produced a rather unique tone. I put everything back as it should be, buttoned up the Bandmaster and sent it on its way, storing the experimental results in my brain as "seed material."

Sometime later the seeds had germinated and a full blown experimental amp was built. 4 output tubes, 4 bias pots, and 4 volume controls where the resistors should be (between the bias pots and the grid, capacitor from the cold end to ground). I could generate all sorts of cool tones with this monster, but the average guitar player would just fry parts since it had no limits.

That evolved into an amp with two output tubes, usually a 6L6GC and an EL34, although some had 6V6GT's and 6L6GC's, and a few used the same output tubes. Several combinations of drive and bias were selectable on a rotary switch which varied from near balanced drive and equal bias currents, to full SE operation with the second tube operating as a CCS to keep the OPT happy. I made about a dozen of these over about 2 years and all were sold to local musicians.

The only complaint was the lack of "traditional" tones, so if I was ever to build more I would include a third tube so that a traditional matched P-P amp tone could be selected. Today this is relatively simple with a microcontroller handling the "rotary switch and dozens of pots" duty.
__________________
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
  Reply With Quote
Old 12th July 2017, 04:51 PM   #23
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Very interesting, but also very crazy, guy‼
__________________
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
  Reply With Quote
Old 12th July 2017, 06:37 PM   #24
voltwide is offline voltwide  Ireland
diyAudio Member
 
Join Date: Jan 2010
You will find that most inspirations emanate from more or less "crazy" people.
  Reply With Quote
Old 12th July 2017, 07:10 PM   #25
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Yeah, almost always. Including me ;-)
__________________
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
  Reply With Quote
Old 17th July 2017, 12:04 AM   #26
Tubelab_com is online now Tubelab_com  United States
diyAudio Member
 
Tubelab_com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Quote:
but also very crazy, guy‼
Crazy, no, crazy is wiring up a 1500 volt power supply to a (US) football sized transmitting tube (833A) with Radio Shack clip leads, connecting up a cabinet with a pair of EV-10 speakers, and plugging an ADA MP-1 and a guitar into it. The results could be heard for about 3 city blocks, especially when I held the guitar up to the speaker for some line breaker tripping feedback!

Note the unique tube socket. Hose clamps and Vice Grips. I made a real frequency response graph too at about 50 watts output. Power at 5% was about 200 watts. Power at overdriven clipping......don't know it blew the 15 amp line breaker.

That was about 10 years ago. Now I am slowly researching a stereo 1 KW tube amp (500 WPC) for guitar and HiFi use. Microprocessor control of things like bias, gain and drive levels, so it can go from clean and mild mannered enough for audiophile quality listening, to full metal racket!

All details of the build will be posted, whether it works or blows up. For now I'm doing some bench experiments on tubes and parts, and finding new ways to crash (or lock up) LT spice.
Attached Images
File Type: jpg 833_1.jpg (154.8 KB, 36 views)
File Type: jpg 833AFreqRespTest2.jpg (532.6 KB, 34 views)
File Type: jpg StratFeedback1.jpg (744.8 KB, 22 views)
__________________
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
  Reply With Quote
Old 17th July 2017, 01:23 AM   #27
coyotesgator is offline coyotesgator  United States
diyAudio Member
 
Join Date: Sep 2007
Location: Texas
That aint crazy, it's freaking brilliant!
  Reply With Quote
Old 17th July 2017, 02:03 PM   #28
AquaTarkus is offline AquaTarkus  Canada
diyAudio Member
 
AquaTarkus's Avatar
 
Join Date: Jan 2017
Back to the Future guitar amp!

Sent from my phone. Please excuse any typpos.
  Reply With Quote
Old 17th July 2017, 06:28 PM   #29
Tubelab_com is online now Tubelab_com  United States
diyAudio Member
 
Tubelab_com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
If I could only find a cabinet like Marty had.

Back To The Future Amp (credits edited) - YouTube
__________________
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......

Last edited by Tubelab_com; 17th July 2017 at 06:31 PM.
  Reply With Quote
Old 18th July 2017, 02:21 PM   #30
voltwide is offline voltwide  Ireland
diyAudio Member
 
Join Date: Jan 2010
Quote:
Originally Posted by Tubelab_com View Post
If I could only find a cabinet like Marty had.

Back To The Future Amp (credits edited) - YouTube
No good idea, does not last very long.
  Reply With Quote

Reply


diy tube stereo guitar project doneHide 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
Modify Bell 3030 into a stereo guitar amp project PPDB Instruments and Amps 46 8th October 2014 04:47 PM
ISO: Guitar-Synth DIY Project Help. knel8025 Instruments and Amps 4 3rd November 2012 12:57 AM
Hi fi stereo tube amp through guitar speakers?? Chief Guitar Works Instruments and Amps 3 21st December 2010 11:21 PM
guitar tube amp as home stereo elementx Instruments and Amps 6 25th October 2005 05:29 PM


New To Site? Need Help?

All times are GMT. The time now is 04:56 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki