Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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

New SE 6P15P project
New SE 6P15P project
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 19th December 2007, 03:33 PM   #11
chrish is offline chrish  Australia
diyAudio Member
 
chrish's Avatar
 
Join Date: Oct 2003
Location: Sydney
Thanks George,

I must admit, since my SimpleSE was so quiet, I "borrowed" a few features. The power supply is almost a direct copy, the 22R resistors were used to bring the voltage to the required level (just modelled in PSII). The cathode bias is a direct copy also...

Next project? I plan to re-build the 6BM8 push-pull project that did not quite work out. I don't really consider it as a failure, it was just a little ambitious as a first point to point project. What I learned from that build allowed me to build this quiet amp ;-) When that is finished, I plan to build a push pull EL84 (6P14P actually) using this http://www.diyaudio.com/forums/showt...626#post826626

Have sourced many of the parts, just power transformer, resistors and power supply electrolytics to go. Could not see any suitable (275-0-275 volt 200 mA) power transformers available in Singapore when I was there, and Antique electronic supply don't have the 300 series Hammond in stock at the moment. Suggestions?

Anyway, here is what I have collected so far for "Baby Huey".

So when can we expect to see the TubeLab SimplePP?
Attached Images
File Type: jpg img_3098.jpg (49.3 KB, 796 views)
  Reply With Quote
Old 20th December 2007, 01:41 AM   #12
arnoldc is offline arnoldc  Philippines
diyAudio Member
 
Join Date: Apr 2003
Location: Makati
Send a message via Yahoo to arnoldc
Thanks Chris!

Congrats on your projects
  Reply With Quote
Old 20th December 2007, 02:46 AM   #13
Tubelab_com is offline Tubelab_com  United States
diyAudio Member
 
Tubelab_com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Quote:
So when can we expect to see the TubeLab SimplePP?
I have been working on it off and on for several months. A familly emergency has unfortunately sidelined most Tubelab activities for the past several months. The situation should improve in January.

The TubelabPP breadboard was on my workbench when a dead TubelabSE came in for repair. It had the large Edcor OPT's and 300B tubes. It was a combination that I never tried before, and it sounded so good, that I kept it around for a week just to listen to it. Now that it is gone, I got the fever again, and I just have to make one since I already have the Edcors and all of the other parts. The parts are all on the bench, but I don't have the time to assemble them. I have to leave town for two weeks, so.... next year!

I have not defined the TubelabPP yet. I have looked at a SimplePP style project using EL84's or maybe 6V6's, and I have been looking at making a new PCB for the driver board used in my 300Beast (a P-P amp) which could be used to drive just about anything. If I get a break next year, I'll do both.

I haven't spent much time looking for 240 volt transformers since we don't need them here, let me look around.
__________________
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 20th December 2007, 01:31 PM   #14
Tubelab_com is offline Tubelab_com  United States
diyAudio Member
 
Tubelab_com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
I have only found three 275-0-275 volt transformers that operate off of 240 volts.

The Hammond 370 HX, which is hard to find, but can be special ordered through most suppliers.

The ugly Hammond 260G which is even harder to find.

The ANTEK AN-3T275 is a reasonably priced toroid that has enough current capability. It does not have a 5 volt winding so you must use SS rectifiers or something like a 6BY5. I have used other Antek toriods with good results. http://toroid-transformer.com/ They are often found on Ebay. Search for user ID johnango.

The One Electron BFT-1B is a posibility, but it is quite expensive so I have never tried one.

I am just using my old standby the Allied 6K56VG cheap and effective, but only 120 volt primary. It is also operating slightly over its ratings, but doesn't seem to get too excited about it.
__________________
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 20th December 2007, 01:51 PM   #15
chrish is offline chrish  Australia
diyAudio Member
 
chrish's Avatar
 
Join Date: Oct 2003
Location: Sydney
Thanks for that George,

I might see how long the Hammond 370HX is on backorder for. Other possibility might be to get the Hammond 302AX, 300-0-300 200mA, about $7 more and tweak the power supply. Should still be able to get two of these and a choke in to the USPS flat rate box (20lb limit).

Cheers,

Chris
  Reply With Quote
Old 20th December 2007, 07:35 PM   #16
Tubelab_com is offline Tubelab_com  United States
diyAudio Member
 
Tubelab_com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Antique Electronics Supply was willing to order me "anything from the Hammond catalog" when I wanted some transformers last year. There were no extra charges, but the transformers had to be paid for at the time of order.

Radio Daze claims the same thing on their web site, but I have not dealt with them.

Another possibility is to use a 240 to 120 volt step down transformer like the Triad N6U (I think the U stands for ugly) to make 120 volts. Then run a 120 volt 50Hz transformer. Keep in mind that many 120 volt transformers are not usable on 50Hz. The Allieds (6K56VG and 6K7VG) are but you must stick to the published ratings. I can get away with overloading them a bit on 60Hz. The N6U is $28 USD from Allied or Mouser. The 6K56VG is $41 from Allied. www.alliedelec.com

I have a stereo P-P test amp using 4 X 6V6's that runs fine on the Allied transformer. It gets about as warm as the 6K56VG in my TubelabSE. It might get too hot on 50 Hz though. If you don't find any other path you could use two, one for each channel.

Some have suggested wiring two 120 volt transformers in series across a 240 volt line. I wouldn't suggest doing that since there is a strong possibility that one channel could draw more current than the other causing unequal voltages between the two transformers. This is a quick way to make toasted parts!
__________________
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 20th December 2007, 07:50 PM   #17
Wavebourn is offline Wavebourn  United States
Designer & Technologist
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
New SE 6P15P project
Quote:
Originally posted by tubelab.com


Some have suggested wiring two 120 volt transformers in series across a 240 volt line. I wouldn't suggest doing that since there is a strong possibility that one channel could draw more current than the other causing unequal voltages between the two transformers. This is a quick way to make toasted parts!

If they are identical connect secondaries in parallel and call it "SimplePT"
__________________
Nothing in the universe is perfect. The ideal things are the ones that are most optimal. Optimization criteria, what matters. When I hear "No Compromise Design", I want to take a sledgehammer and test how impact-proof it is.
  Reply With Quote
Old 21st December 2007, 01:10 AM   #18
chrish is offline chrish  Australia
diyAudio Member
 
chrish's Avatar
 
Join Date: Oct 2003
Location: Sydney
Thanks for the help guys. Will be away with work for the next three weeks, so not in any real rush to get these. I will be in Singapore over Christmas, so will search a round a little more up there during a break. Anyway, this is just a hobby to keep the brain active when I am not at work. I have plenty of amps to power my speakers, so waiting a little is no problem.

Cheers,

Chris
  Reply With Quote
Old 21st December 2007, 06:57 AM   #19
chrish is offline chrish  Australia
diyAudio Member
 
chrish's Avatar
 
Join Date: Oct 2003
Location: Sydney
Finished the mFonkens to go with the amp.
Attached Images
File Type: jpg img_3100.jpg (50.7 KB, 654 views)
  Reply With Quote
Old 21st December 2007, 12:22 PM   #20
Rob11966 is offline Rob11966  Australia
diyAudio Member
 
Rob11966's Avatar
 
Join Date: Jun 2007
Location: Australia
Hi Chris,

Great looking amp - it must be the time of year for finished projects. Looks really neat, I love the chassis. I noticed that tubelab mentioned radiodaze. I can vouch for those guys and have bought quite a bit of stuff from them. They are really easy to deal with, honest and super quick - like really quick. I always check to see if they have what I want before I buy anywhere else. The ordering system is clunky and antiquated but once you get over that they are fantastic to deal with.

Looking forward to seeing you next project.

Cheers,

Rob
  Reply With Quote

Reply


New SE 6P15P projectHide 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
PP amp using 6p15P pwan Tubes / Valves 5 23rd September 2013 07:24 AM
6P15P Tubes: Push Pull Possible? maal1605 Tubes / Valves 95 15th May 2013 11:11 PM
6P15P hybrid amp schema? L30N^_^H34RT Tubes / Valves 16 19th January 2008 05:20 PM


New To Site? Need Help?

All times are GMT. The time now is 05:35 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki