pre amp power - 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 13th August 2014, 06:47 PM   #1
Atk1d is offline Atk1d  Canada
diyAudio Member
 
Join Date: Mar 2014
Default pre amp power

Hi every one I am visiting my brother who has just finished his SSE, I've checked it over all appears to be good and wired correctly, The driving tubes, Rectifier tube light as they should, pre amp (12at7) seems to have zero power.

will try to apply photos

Any help trouble shooting would be great.

Thanks to all who respond
  Reply With Quote
Old 13th August 2014, 10:33 PM   #2
Atk1d is offline Atk1d  Canada
diyAudio Member
 
Join Date: Mar 2014
Default Pre amp power- no sound

Well after reflowing all solder connections pre-amp section has power, but have no sound, can not find b+ on any of the tubes, or the opt (red wire)

opt= edcore cxe25-8-5k
pt=edcore xpwr 120 ( red at board 375v, yell, brown at board 6v, blk/red,wht/brown)

have amp wired for ul mode w cathode feedback.
please help
Thank you to all again.
  Reply With Quote
Old 13th August 2014, 11:17 PM   #3
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Check your power supply for volts.
  Reply With Quote
Old 14th August 2014, 02:35 AM   #4
Atk1d is offline Atk1d  Canada
diyAudio Member
 
Join Date: Mar 2014
power supply is 120 in
red wire are 375v
yellow wire 5v
Brown wire 6.3v
two others black/red centre tap Of primary350 and white /brown 6.3 both not used

I was reading another post where the ccs's were bad and these may be bad also as G=.3 k too and A is 425

new ccs's are on order will wait. I hope this works as my brother is frustrated thus far.
Also still can not locate a B+ reading across any pins (3) on any tube or from opt(red wire)

Last edited by Atk1d; 14th August 2014 at 02:39 AM.
  Reply With Quote
Old 15th August 2014, 05:07 PM   #5
Atk1d is offline Atk1d  Canada
diyAudio Member
 
Join Date: Mar 2014
well after some effort, we switched out boards, and b+ is Right side 235-240 left side 845
still no sound.......... volume pot is alps 100k, all connections verified ohms climbs when volume is turned up.
input signal same....as far as we can identify some help here would be good too
need a little help identifying where loss of signal could be happening
Also why the B+ is so different from side to side
we've checked the schematic but need to know what values should be at given points when power applied. Should help isolate bad parts.

to retstate... pt = xwpr025 350-0-350 decor
opt = cxe 25w-8-5k also from decor

power choke (edcore)
aux supply cap = clarity cap tc45uk700v 1306b

Thank you to all who respond
  Reply With Quote
Old 15th August 2014, 08:15 PM   #6
Atk1d is offline Atk1d  Canada
diyAudio Member
 
Join Date: Mar 2014
Default no sound

following up with my other post here is a picture
I have connected the ct of 370v from pt (is inclusive with photo) which makes the rectifier glow red hot so I have disconnected until I learn different.

note the rectifier is a china made 5z3pa 73iv or 731v
for now its all that is available, a sovtek 5ar4 is on order

This board is of the new style, cl140 and two diodes are in place

Please help
should the ct be used?
where should we check for loss of signal
Attached Images
File Type: jpg Photo on 2014-08-15 at 4.15 PM.jpg (252.5 KB, 125 views)
  Reply With Quote
Old 22nd August 2014, 10:27 PM   #7
zxx222 is offline zxx222  Europe
diyAudio Member
 
Join Date: Aug 2005
Location: b
Did you read sse wiring diagrams page on tubelab webpage? First picture clearly shows that you should use center tap of your high voltage winding. Read everything carefully. Without center tap you have 700 volts across high voltage secondaries.
According to your rectifier datasheet first cap maximum is 4uF and SSE first cap is 47 uF. I am very surprised that it did not explode when you switched on amp. Try your best to do everything according to sse manual - It is not so difficult.
  Reply With Quote
Old 23rd August 2014, 05:31 AM   #8
Atk1d is offline Atk1d  Canada
diyAudio Member
 
Join Date: Mar 2014
zxx222 Thank you for responding, He's very good at practicing medicine(my brother) sadly not so good with electronics( strange our Father was an electronics guru(like George)) so I have decided ( just received) a new board going to populate it test with my working amp and ship back to him.
Also I have advised him to order one or more sovtek 5ar4 tubes I use one and love it.
The center tap was used on the previous board made the rectifier plates glow red, something was amiss either the rectifier used was incorrect (most likely) or something soldered in the wrong place. All parts came from Mouser so the unlikely hood of bogus parts seems well........ unlikely. I spent three days of my vacation trying to figure it out. ultimately no sound from either board used
One last try with new board, I hope it works or out in Nova Scotia there is going to be some new debris in the ocean ( kidding)
Thanks again
  Reply With Quote
Old 23rd August 2014, 07:09 AM   #9
zxx222 is offline zxx222  Europe
diyAudio Member
 
Join Date: Aug 2005
Location: b
Use 5ar4 rectifier. Check u10 and u20 - you soldered them on other side of board and it seems that in wrong direction. Look at board photos of other sse builders on this thread and you will see what I mean.
  Reply With Quote
Old 23rd August 2014, 02:38 PM   #10
Atk1d is offline Atk1d  Canada
diyAudio Member
 
Join Date: Mar 2014
I know it appears that way but in fact they are in correctly, and really at this point it does not matter, that board as stated, has been abandoned.Also the sovtek 5ar4 will be used as stated
But thanks anyway.
  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 suply for Pre & Phono Use tube 6BM8 dia thien thai Tubes / Valves 5 23rd November 2011 05:17 PM
Robert Grodinsky Research Pre & Power Amp info? thejohn Solid State 13 8th October 2011 01:22 PM
Seperate power supply for pre-amp section in integrated amp? KevinLee Solid State 8 2nd February 2008 11:20 PM
WIll an X-PSU v1 power an SI T-amp &/or TC754 pre-amp? gnostic19 Class D 7 3rd August 2007 02:26 AM
Using power supply to power pre-amp? preiter Chip Amps 4 11th May 2006 01:52 PM


New To Site? Need Help?

All times are GMT. The time now is 12:28 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