TSE Help! - Page 2 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs 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 6th March 2017, 01:42 PM   #11
diyAudio Member
 
craigtone's Avatar
 
Join Date: Apr 2006
Location: Holland, MI
I can but I am not sure how useful that will be as it is installed in a chassis currently so I can only snap a picture of the bottom side ... see attached.

As I mentioned prior, this is a clone of my unit which is working properly and has the exact same components on each board. The only difference is I added a switch to go from 2.5V to 5V filament, a volume control and of course different tubes (but we also have swapped tubes to rule that out as well).

FYI - You'll notice the wires running to the location of R18/R29 ... these run to a 10-ohm shunt mA panel meter (with the resistors removed) so we can set the bias visually without requiring a multimeter.
Attached Images
File Type: jpg IMG_6734.jpg (1.01 MB, 168 views)
__________________
Craigtone Audio
Paradox DL-103R, P2-24, Pearl 2, Apollo-R, D100 Mk2, Mezmerize, TSE 45, ALK Klipschorns

Last edited by craigtone; 6th March 2017 at 01:45 PM.
  Reply With Quote
Old 6th March 2017, 05:04 PM   #12
diyAudio Member
 
Join Date: Feb 2016
Location: New York City
I know that I and others had a problem with a connection between the two sides of the board that was diagnosed by Win W5jag as follows:

Also, the center pin of one of the 10M45's is used to pass voltage between the top and bottom sides of the board; if the solder doesn't plate through the hole, shenanigans occur. It's described on the last page of the 801A in Tubelab SE thread a page or two back.

Win W5JAG


Just a suggestion.
  Reply With Quote
Old 26th March 2017, 10:56 PM   #13
diyAudio Member
 
craigtone's Avatar
 
Join Date: Apr 2006
Location: Holland, MI
Quote:
Originally Posted by colnago55 View Post
I know that I and others had a problem with a connection between the two sides of the board that was diagnosed by Win W5jag as follows:

Also, the center pin of one of the 10M45's is used to pass voltage between the top and bottom sides of the board; if the solder doesn't plate through the hole, shenanigans occur. It's described on the last page of the 801A in Tubelab SE thread a page or two back.

Win W5JAG


Just a suggestion.
I checked this today ... I reflowed the center pin of both CCS to ensure a good fillet on top and bottom side of the PCB. I powered it up and one side started rising in bias so I killed power at about 40mA. I pulled all the tubes and reset the initial start-up procedure by setting grid to most negative, installing 5842's, setting their plate and then I installed the 45's and again ... they will not conduct! I can turn the bias pot all the way in both directions and nothing.

I'm about at my wit's end!
__________________
Craigtone Audio
Paradox DL-103R, P2-24, Pearl 2, Apollo-R, D100 Mk2, Mezmerize, TSE 45, ALK Klipschorns
  Reply With Quote
Old 9th April 2017, 01:26 PM   #14
diyAudio Member
 
Tubelab_com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
There are four possible reasons that the 45's don't conduct. You should be able to test most of this without any output tubes in the board. All observations and measurements are made while looking at the top side of the board from the front (volume pot area towards you, rectifier on the left, output tubes in the back). The black meter lead should be connected to a known good ground.

#1) Dead tubes. You swapped tubes around, so this isn't it.

#2) No plate voltage. There should be B+ on pin 2 of the output tubes (left rear pin).

#3) Filament not glowing. There should be 2.5 volts on pin 1 of the output tubes (right front pin).

#4) Too much negative bias. The voltage on pin 3 should be adjustable over a range from -30 to about -100 volts.

If all of this checks out, make sure that the tube sockets have not been installed such that the pins are rotated 90 degrees. I did this once on an early build and it took me a while to find 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 9th April 2017, 06:11 PM   #15
diyAudio Member
 
Join Date: Feb 2016
Location: New York City
As I remember it, the power tube pins are mislabeled on some boards.

The assembly manual points this out.
  Reply With Quote
Old 10th April 2017, 03:00 PM   #16
diyAudio Member
 
craigtone's Avatar
 
Join Date: Apr 2006
Location: Holland, MI
Quote:
Originally Posted by Tubelab_com View Post
There are four possible reasons that the 45's don't conduct. You should be able to test most of this without any output tubes in the board. All observations and measurements are made while looking at the top side of the board from the front (volume pot area towards you, rectifier on the left, output tubes in the back). The black meter lead should be connected to a known good ground.

#1) Dead tubes. You swapped tubes around, so this isn't it.

#2) No plate voltage. There should be B+ on pin 2 of the output tubes (left rear pin).

#3) Filament not glowing. There should be 2.5 volts on pin 1 of the output tubes (right front pin).

#4) Too much negative bias. The voltage on pin 3 should be adjustable over a range from -30 to about -100 volts.

If all of this checks out, make sure that the tube sockets have not been installed such that the pins are rotated 90 degrees. I did this once on an early build and it took me a while to find it.

Everything is good except for #4 ...

On my amp which works, my grid swings from -240V to -143V. His is swinging from -255V to -232V with the exact same parts installed, same power transformer, etc.

Is it possible that mine is just on the cusp of having too much negative bias due to component tolerances?
__________________
Craigtone Audio
Paradox DL-103R, P2-24, Pearl 2, Apollo-R, D100 Mk2, Mezmerize, TSE 45, ALK Klipschorns
  Reply With Quote
Old 13th April 2017, 08:43 PM   #17
diyAudio Member
 
Tubelab_com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Quote:
my grid swings from -240V to -143V. His is swinging from -255V to -232V
Is it possible that mine is just on the cusp of having too much negative bias due to component tolerances?

Yes, yours is on the edge of not working. Can you adjust the bias current to at least 50 mA or more?

What output tubes are you using. I somehow thought that you were running 45's which would not conduct at all on these voltages.

-143 volts should cut off even a 300B unless you are feeding it well over 400 volts. -232 volts will cut off any tube that I can think of that fits into a small 4 pin socket.
__________________
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 8th May 2017, 03:55 PM   #18
diyAudio Member
 
craigtone's Avatar
 
Join Date: Apr 2006
Location: Holland, MI
Quote:
Originally Posted by Tubelab_com View Post
Is it possible that mine is just on the cusp of having too much negative bias due to component tolerances?

Yes, yours is on the edge of not working. Can you adjust the bias current to at least 50 mA or more?

What output tubes are you using. I somehow thought that you were running 45's which would not conduct at all on these voltages.

-143 volts should cut off even a 300B unless you are feeding it well over 400 volts. -232 volts will cut off any tube that I can think of that fits into a small 4 pin socket.

Yes, I am running CX-345's

My -240V to -143V is no load (without power tubes installed). With load and both biased at 30mA, my B+ is 255V and grid is -24V. I can't get his to conduct, so I can't measure it under load.
__________________
Craigtone Audio
Paradox DL-103R, P2-24, Pearl 2, Apollo-R, D100 Mk2, Mezmerize, TSE 45, ALK Klipschorns

Last edited by craigtone; 8th May 2017 at 04:21 PM.
  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
When to adjust B+ TSE Guarnera Tubelab 5 16th April 2014 02:08 PM
TSE C6? Guarnera Tubelab 2 19th February 2014 03:55 PM
TSE input jrobson Tubelab 7 9th December 2012 04:33 PM
TSE question.. Green77 Tubelab 17 28th September 2012 07:50 PM
TSE help evanc Tubelab 2 12th June 2012 10:14 AM


New To Site? Need Help?

All times are GMT. The time now is 03:51 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki