Simple PP Power TX? - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Reply
 
Thread Tools Search this Thread
Old 5th October 2010, 04:55 PM   #1
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Default Simple PP Power TX?

I just received a board and parts kit for a Simple PP, and it's time to start collecting mechanical parts / TX, planning layout, etc.

Out of curiosity, has anyone experimented with separate plate & filament TX on any of George's designs? This is something that I've done in the past out of necessity with several scrap box projects, and except for the slight increase in real estate required, they worked out well enough.

Looking at Edcor and Hammond pricing, it might not necessarily cost more to go to separate iron for the low & high voltages.

With any luck, this will be one of at least 3 amp projects that I'll get happening during those long cold winter nights on the wet coast.
__________________
now on sabbatical
  Reply With Quote
Old 13th October 2010, 08:11 PM   #2
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
well, since no particularly strong advice one way or the other, I went ahead and ordered the 272HX along with sundry other parts for this and several projects from PCXN - upon their arrival, it'll be time to start mock-up of parts layout

I may even take some pictures.
__________________
now on sabbatical
  Reply With Quote
Old 2nd November 2010, 06:56 AM   #3
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
Should work fine,perhaps even better than a single transformer because any HF switching noise (SS rect.,etc.) won't creep into the filament windings (and vice-versa) via capacitance between the windings. Also,if you feel so inclined,you can add a standby setup,and heat the filaments before powering up the B+.
  Reply With Quote
Old 2nd November 2010, 02:40 PM   #4
diyAudio Member
 
tubelab.com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Quote:
I went ahead and ordered the 272HX
The 272HX is an "all in one" transformer. It is the one that I am using to run my Simple P-P. It works good. You will get about 350 volts of B+. Use a good quality EL84. I use JJ's in my amp. I have some old Sylvania 6BQ5's that work good too. Some of the stuff sold as EL84's on Ebay will glow red.
__________________
Too much power is almost enough! Turn it up till it explodes - then back up just a little.
  Reply With Quote
Old 2nd November 2010, 05:13 PM   #5
diyAudio Member
 
vinylkid58's Avatar
 
Join Date: May 2005
Location: Victoria, B.C.
Quote:
Originally Posted by chrisb View Post
With any luck, this will be one of at least 3 amp projects that I'll get happening during those long cold winter nights on the wet coast.
Tube amps were made for this climate. Nothing like gathering around the hifi with a hot beverage.

jeff
  Reply With Quote
Old 2nd November 2010, 05:28 PM   #6
diyAudio Member
 
tubelab.com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Quote:
With any luck, this will be one of at least 3 amp projects that I'll get happening during those long cold winter nights on the wet coast.
I am at the other extreme climate wise. The winter is the only time of year that I can set my table saw up outside to make speaker cabinets. Last Saturday (Oct. 30) the temp hit 90F in the afternoon.
__________________
Too much power is almost enough! Turn it up till it explodes - then back up just a little.
  Reply With Quote
Old 8th November 2010, 12:06 AM   #7
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Quote:
Originally Posted by tubelab.com View Post
The 272HX is an "all in one" transformer. It is the one that I am using to run my Simple P-P. It works good. You will get about 350 volts of B+. Use a good quality EL84. I use JJ's in my amp. I have some old Sylvania 6BQ5's that work good too. Some of the stuff sold as EL84's on Ebay will glow red.

OK - now I'm at the point where I'm connecting the wiring to the board and have a dumb question - the 272HX has center taps on both filament windings - as these are not used, do I simply dead-head them?
__________________
now on sabbatical
  Reply With Quote
Old 8th November 2010, 01:40 AM   #8
diyAudio Member
 
tubelab.com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Quote:
the 272HX has center taps on both filament windings - as these are not used, do I simply dead-head them?
Yes, tape them up, cut them off, or hide them in any manner you choose such that they are not connected to anything. The 5 volt center tap will have full B+ voltage on it.
__________________
Too much power is almost enough! Turn it up till it explodes - then back up just a little.
  Reply With Quote
Old 8th November 2010, 01:45 AM   #9
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Quote:
Originally Posted by tubelab.com View Post
Yes, tape them up, cut them off, or hide them in any manner you choose such that they are not connected to anything. The 5 volt center tap will have full B+ voltage on it.
thanks George - easily done - see my other question re pentode mode screen supply - forgive me if this has been answered before, but my search skills are worse than Dave's speaker construction
__________________
now on sabbatical
  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
Power Tx Myth? M Gregg Tubes / Valves 47 2nd September 2010 12:25 PM
The simple PP royd55 Tubelab 3 11th January 2010 01:50 AM
Simple amp with directcoupled PP-follower revintage Solid State 16 22nd December 2009 12:10 PM
help wiring these power tx riotubes Parts 14 16th November 2008 02:06 AM
Simple IT PP James D. Tubes / Valves 12 18th March 2003 08:36 AM


New To Site? Need Help?

All times are GMT. The time now is 12:02 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