TSE pre checkout check. - 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 9th July 2014, 02:26 PM   #1
diyAudio Member
 
Join Date: Jan 2012
Default TSE pre checkout check.

Hey all,

I've put my 300b SE together ready for its first check and adjustment (I hope) but I would like to double check my wring first particularly the volume pot.

I'm using the Edcor XPWR131-240 PT.

So far I have:

TI-1 = White - HV centre tap
TI-2 = Yellow - 2.5v
TI-3 = Yellow - 2.5v
TI-4 = Orange - 330v
TI-5 = Red - 330v
TI-6 = White/Brown - 3.15v centre tap
TI-7 = Brown - 3.15v
TI-8 = Brown - 3.15v

The remaining transformer wires, are these used? Unless I've missed something I'm assuming they're for other configurations? These are:

White/Yellow - 2.5v centre tap
White/Orange - 260v
Black/Red - 260v

Re the volume, I'm guessing:

L-1 = Left channel ground
L-2 = Left channel signal

R-1 = Right channel ground
R-2 = Right channel signal

Thanks guys.

Will it all go up in smoke...
  Reply With Quote
Old 9th July 2014, 02:36 PM   #2
diyAudio Member
 
Join Date: Jan 2012
Oh, I assume GND-2 is for grounding?

Is there anything I've missed?

Click the image to open in full size.

Last edited by mudchute; 9th July 2014 at 02:39 PM.
  Reply With Quote
Old 9th July 2014, 05:19 PM   #3
diyAudio Member
 
Join Date: Jan 2012
I took the plunge, Board is grounded, everything hooked up and first power up done.

With the rectifier tube in and nothing else I'm getting 425v of b+.

I need another meter before I can start on the rest. Is it fair for the b+ to be so high with no other tubes in?
  Reply With Quote
Old 9th July 2014, 08:09 PM   #4
diyAudio Member
 
Join Date: Jan 2012
So, here I am so far.

B+ is 345ish volts.

Both 300b's are stable at 69ma.

Both driver tubes are stable at 177 volts.

Sounds great so far, concerned that the drivers tubes, on start up are drawing big volts before settling down, mid 200ish volts, is it a time bomb? I have a cl90 on the iec's live terminal, can I put one elsewhere?

Also, I have 36k resistors in r25 & r14, I was expecting a b+ of nearer 400v?
  Reply With Quote
Old 9th July 2014, 08:11 PM   #5
diyAudio Member
 
Join Date: Jan 2012
Click the image to open in full size.

Happy day today
  Reply With Quote
Old 9th July 2014, 11:08 PM   #6
YashN is offline YashN  Canada
diyAudio Member
 
Join Date: Dec 2013
Location: Canada
Way to go, mudchute.
  Reply With Quote
Old 10th July 2014, 08:27 AM   #7
diyAudio Member
 
Join Date: Jan 2012
Thanks Yashn, hopefully Itll stay in one piece...

Is it safe to couple the heatsinks to the chassis? The current ones are isolated from the components but it seems awfully risky...
  Reply With Quote
Old 10th July 2014, 10:45 AM   #8
diyAudio Member
 
Join Date: Jan 2012
First start up today. The 5842 voltages are concerning. The left channel goes to approx 200v then settles to 170v. The right channel goes to just over 300v before dropping to 170v. The right channel also lags behind the left in playing music and r9 is turned down a good amount less than r20?

Should I be worried?

I've swapped the 5842's around and the fault followed the tube...

Last edited by mudchute; 10th July 2014 at 10:49 AM.
  Reply With Quote
Old 10th July 2014, 03:05 PM   #9
diyAudio Member
 
jpjones3318's Avatar
 
Join Date: Jan 2011
Location: Boulder, CO
Normal. The voltages will be high until the tubes start conducting, and the adjustment was added due to a high variability between tubes.
  Reply With Quote
Old 10th July 2014, 07:13 PM   #10
diyAudio Member
 
Join Date: Jan 2012
All working and stable so far.

Re grounding, I've grounded the board direct to the iec and put a grounding stud near the iec and grounded the chassis from that to the iec.

Am I supposed to ground anything else?

I've got no hum or other anomalies occurring.
  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
Checkout problem TSE. Markman65 Tubelab 21 10th April 2014 03:25 PM
TSE checkout help positive grid voltage pbkrag Tubelab 1 21st December 2013 09:12 PM
Checkout double check. mudchute Tubelab 2 8th April 2013 11:27 PM
TSE checkout-unable to adjust 5842 voltage stonehome Tubelab 26 11th July 2012 08:49 PM
45 TSE Checkout Fail Alan Hope Tubelab 13 17th January 2012 08:42 PM


New To Site? Need Help?

All times are GMT. The time now is 06:54 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