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

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Reply
 
Thread Tools Search this Thread
Old 15th June 2020, 06:11 AM   #1
minerwelder is offline minerwelder  United States
diyAudio Member
 
Join Date: May 2020
Location: Boonies Wyoming
Default Another SSE Power Trans question

I've been reading every thread about SSE and have a question on Power trans here are two from Edcor.
1- XPWR222 Power transformer for a 120V, 60Hz. line to 750V (375-0-375) at 350mA center tapped, 6.3V at 6A and 5V at 6A. ? is 350mA to much.
2- XPWR033 Power transformer for a 120Vrms, 60Hz.or 240Vrms, 50/60Hz. line to 760V (380-0-380) at 200mA center tapped, 6.3V at 5A and 5V at 3A. I've seen others using this one but having problems with the 760V (380-0-380).
I'm looking at KT88, 90, 120 outputs, if the first one will work then the voltage will be better. I'm going with choke no SS and putting CFB and mode switches in, I'm using High efficiency speakers 35Hz to 20kHz, 92dB.
These are the OPTs I'm looking at GXSE15-5K - 15W, 100mA, Screen/Grid Tap 40%, Frequency Response 40~18K Hz., <1dBu.
Is the 560ohm 5W R17, R27 good or do I need 680ohm 5W, just getting build list made any changes or upgrades you see or know of would be listened to.
Thanks in advance Kevin
  Reply With Quote
Old 16th June 2020, 10:44 AM   #2
minerwelder is offline minerwelder  United States
diyAudio Member
 
Join Date: May 2020
Location: Boonies Wyoming
Ok I'll add on and see if I can get help and learn, I was thinking of using the XPWR033 but was worried about the higher voltage since George recommends max of 375 per side, then I just found the XPWR222 now I want to make sure the 350 mA is not to much! I understand amperage and voltage for house and automotive but I'm new to tube amp high voltage.
  Reply With Quote
Old 16th June 2020, 12:11 PM   #3
dwinstonwood is offline dwinstonwood  United States
diyAudio Member
 
Join Date: Oct 2015
Location: Nawth-Side o'the Rivuh
My XPWR035 only get warm to the touch after hours of running.

740V (370-0-370) at 200mA center tapped, 6.3V (3.15-0-3.15) at 5A center tapped and 5V at 2A.

David
  Reply With Quote
Old 16th June 2020, 02:03 PM   #4
Dale Saukerson is offline Dale Saukerson
diyAudio Member
 
Join Date: Jan 2019
Do not worry about excess amperage. Excess amperage is not forced thru the circuit or tubes. The tubes and circuit will only take what they need or are biased for. However the voltage output of a transformer will be somewhat higher if the circuit does not use the full capacity of the transformer. The voltage ratings for a transformer assume all windings are utilized and utilized to their published specs.
  Reply With Quote
Old 17th June 2020, 03:12 AM   #5
minerwelder is offline minerwelder  United States
diyAudio Member
 
Join Date: May 2020
Location: Boonies Wyoming
Quote:
Originally Posted by Dale Saukerson View Post
Do not worry about excess amperage. Excess amperage is not forced thru the circuit or tubes. The tubes and circuit will only take what they need or are biased for. However the voltage output of a transformer will be somewhat higher if the circuit does not use the full capacity of the transformer. The voltage ratings for a transformer assume all windings are utilized and utilized to their published specs.
Ok so the XPWR222 with 350mA on 375-0-375, and 6amp ,6.3v, and 5v could run a higher B+, so would the 5U4 tube for rectifier help bring the B+ down?
  Reply With Quote
Old 17th June 2020, 06:12 PM   #6
Dale Saukerson is offline Dale Saukerson
diyAudio Member
 
Join Date: Jan 2019
The 5u4 does have a greater voltage drop than the 5ar4, which can be used to reduce B+ if that is an issue in your build.
  Reply With Quote
Old 17th June 2020, 08:32 PM   #7
amandarae is offline amandarae  United States
diyAudio Member
 
amandarae's Avatar
 
Join Date: Oct 2004
Location: Diamond Bar, CA
Hi,
Long time lurker here.
I have Hammond 374BX (375-0-375, 201 mA) in my amp using 5AR4 (GZ34) and have no problems at all. I built my unit in 2011 and thankfully performing as if it's brand new. I run SE using EL34 nowadays. I prefer it as it sounds close to my 300B (Tubelab SE of course!).

Also, 92 dB is not high efficiency if you are concern about the noise. It is not even mid-efficiency! The amp is dead silent using Altec 414A (running full range at 99dB) and Altec 802D (104 dB), so rest assured that if you build the amp per George and other users documentations here, you will be fine. Tubelab SE 300B in the middle, SE on the floor waiting its turn

Click the image to open in full size.

Enjoy your build, you will love the amp!

Last edited by amandarae; 17th June 2020 at 08:48 PM. Reason: ad pic
  Reply With Quote
Old 18th June 2020, 05:42 AM   #8
minerwelder is offline minerwelder  United States
diyAudio Member
 
Join Date: May 2020
Location: Boonies Wyoming
Thanks everyone I've been reading all the SSE builds and threads, I'm new to Tube amps, Just want to hear the sound that I did when I was a kid with my parents old console.
Nice System amandarae, I like your wood enclosures. I have the PCB from Tubelab and have my parts for the board in a project on mouser, that's why I'm asking questions to make sure on all the parts so I don't have to place second order!

Last edited by minerwelder; 18th June 2020 at 05:46 AM. Reason: wanted to add more info.
  Reply With Quote
Old 20th June 2020, 04:56 PM   #9
Mmcaleer is offline Mmcaleer  United States
diyAudio Member
 
Join Date: Apr 2020
Location: Frisco, TX
Quote:
Originally Posted by amandarae View Post
Hi,
Long time lurker here.
I have Hammond 374BX (375-0-375, 201 mA) in my amp using 5AR4 (GZ34) and have no problems at all. I built my unit in 2011 and thankfully performing as if it's brand new. I run SE using EL34 nowadays. I prefer it as it sounds close to my 300B (Tubelab SE of course!).

Also, 92 dB is not high efficiency if you are concern about the noise. It is not even mid-efficiency! The amp is dead silent using Altec 414A (running full range at 99dB) and Altec 802D (104 dB), so rest assured that if you build the amp per George and other users documentations here, you will be fine. Tubelab SE 300B in the middle, SE on the floor waiting its turn

Click the image to open in full size.

Enjoy your build, you will love the amp!
Love your setup. Tell me about those horn speakers. Those are wonderful.
  Reply With Quote
Old 20th June 2020, 05:30 PM   #10
amandarae is offline amandarae  United States
diyAudio Member
 
amandarae's Avatar
 
Join Date: Oct 2004
Location: Diamond Bar, CA
Quote:
Originally Posted by Mmcaleer View Post
Love your setup. Tell me about those horn speakers. Those are wonderful.
Thank you! As stated already, Altec drivers with Azura Horns with 1.4" throat (Azurahorn -Le Cleac'h Acoustic Horn Loudspeakers). Cabinet is Altec 614.
 

Reply


Another SSE Power Trans questionHide 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
Toroid Power Trans/Power Supply Question dtaylo3 Power Supplies 1 1st June 2016 07:21 AM
2300 ohm vs 5000 ohm output trans question speakerfritz Tubes / Valves 4 2nd October 2010 10:17 PM
Question regarding to output power trans hc167 Solid State 14 28th June 2008 09:41 AM
Power Trans question diaz028 Tubes / Valves 9 26th March 2008 07:58 PM
Power Trans Question cominup Parts 8 9th June 2005 08:06 PM


New To Site? Need Help?

All times are GMT. The time now is 11:08 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki