Go Back   Home > Forums > >

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

6BG6 Push Pull Parallel Amp Build
6BG6 Push Pull Parallel Amp Build
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
Old 29th September 2014, 05:00 PM   #1
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
6BG6 Push Pull Parallel Amp Build
Default 6BG6 Push Pull Parallel Amp Build

First off I'd like to recognize PMillet for the excellent write up on his "807" Push-Pull Amp that is the inspiration for this project.

I recently picked up 8 used and reasonably well matched 6BG6G tubes.
The glass is nice and clear with bottom getter, they really are beautiful.
I have been doing a bit of research lately about the 807 PP amps I have been able to find out there.
I came across the 807PP amp from PMillet and I really like the idea of using his driver and PCB boards with my monoblocks.
However his design shows about 40W before clipping with 807ish tubes in PPP.
The Ducan TDSL sheet shows AB1 PP for 6BG6 at 450Va, 400Vg2, -37Vg1 giving 55W out on a 5.6K OPT w/ 1.8% THD.
I would like to take this info and build a PPP 6BG6 at those voltages.....what kind of power out can I expect and what would be a reasonable OPT value to use 3.5K???
I'd like around 100W monoblocks, is this a reasonable expectation?
I'd like to stick with Edcor transformers all the way around except the chokes which will most likely be Triad.
I am not opposed to using Valve Regulators to get the miscellaneous voltages I need I actually think they are kinda cool.
Any input would be MUCH appreciated, this will be a semi-long term project because I don't want to cut corners on quality to a reasonable extent.
I will be building these as Monoblocks so I know I will need about 6A on the 6.3V heater and I will be using tube rectification instead of SS, I may consider hybrid rectification if there is a good enough argument for it.
Attached Images
File Type: jpg 6BG6 Set.jpg (1.03 MB, 427 views)
File Type: jpg 6BG6.jpg (318.1 KB, 420 views)
File Type: png 6BG6G Data.png (26.6 KB, 378 views)
File Type: png 6BG6G PPP BLock Diagram.png (86.3 KB, 390 views)
File Type: png 6BG6 PPP Power Tranny.png (108.0 KB, 395 views)
  Reply With Quote
Old 29th September 2014, 05:23 PM   #2
zigzagflux is offline zigzagflux  United States
diyAudio Member
 
zigzagflux's Avatar
 
Join Date: Oct 2006
Location: Charlotte, NC
Good luck; I have often thought about building a PP-6BG6 amp. The indirect heating just makes things so much easier.

Your back-to-back diodes are commonly used to tie circuit common to chassis, in an attempt to reduce ground loops. The way you have your diodes arranged breaks code. The third prong of the power inlet should bond directly to chassis with no intentional impedance. Relocate those diodes to go between chassis and circuit common.
  Reply With Quote
Old 8th January 2015, 11:19 AM   #3
Too much stuff is offline Too much stuff  Canada
diyAudio Member
 
Join Date: Mar 2011
Location: Fairport Beach (in Pickering), Ontario
Just wondering if you managed to build this amp?
  Reply With Quote
Old 8th January 2015, 12:42 PM   #4
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
6BG6 Push Pull Parallel Amp Build
I just received the PCB's and I have completed acquiring all the oddball tubes to populate the driver PCB.
I am in the process of building a Mouser order for all the bits and bobs to go on the boards.
Then it's on to layout of the top plate since I'm planning on using 4 damper diodes instead of the SS rectifiers and I will use some Motor Run caps in the P/S also.
I have a feeling that these will be HUGE.
14"x21" maybe, so I will definitely need to order more .125" Aluminum and more Tiger Maple for the chassis'.
  Reply to this post

Reply


6BG6 Push Pull Parallel Amp BuildHide this!Advertise here!
Thread Tools

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
First amp build - a Tubelab simple push-pull emi23 Tubelab 2 2nd April 2016 03:52 AM
Looking to build my first amp, adding push-pull to 386 need advice rudyauction509 Solid State 0 27th July 2014 12:43 AM
What amp to build? Push Pull, SE? thoughts? tipetu Tubes / Valves 52 11th May 2012 09:45 AM
Parallel-Push-Pull KT66 organ amp conversion ??? jon_010101 Tubes / Valves 3 2nd June 2006 01:53 AM
modify parallel push-pull EL84 to single push-pull chungtat Tubes / Valves 12 3rd November 2005 11:25 PM


New To Site? Need Help?

All times are GMT. The time now is 10:31 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki