Tubelab SE board for PSE - 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 28th April 2010, 08:08 AM   #1
diyAudio Member
 
Join Date: Aug 2006
Default Tubelab SE board for PSE

Hello Tubelab fans,

For my electrostatic speakers, I am planning a pair of Tubelab 300b PSE monos, using two boards.

If you have an experience of paralleling the TSE output stage, what was your configuration for the other stages? Any comparison for better sonic performance?

If you were me, how would you proceed your experiment?

Thank you,
Yoshi
  Reply With Quote
Old 28th April 2010, 03:31 PM   #2
diyAudio Member
 
Join Date: Apr 2007
I've built a TSE monoblock which was discussed here. My reason for this was to use TSE for center channel of my home theater setup which doubles as stereo system (already using TSE for L & R speakers) so that I would have matching s.e.t. sound for front 3 speakers.

Given the parameters of output tubes and transformers that can be used for TSE, I'm not sure how beneficial it would be to go mono for dealing with electrostatic speakers. What's the spec like for your speakers?
  Reply With Quote
Old 28th April 2010, 04:38 PM   #3
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
Are you building two monoblocks with two board each? ESLs are a tough customer for any SE amp. Have you thought at all about push-pull?
  Reply With Quote
Old 28th April 2010, 05:49 PM   #4
diyAudio Member
 
Join Date: Aug 2006
Evenharmonics,

Let me tell you my tube amp history. My first tube amp was a direct coupled 6c45-2A3 SE stereo (free-lunch, DRD type), which was originally built to drive my AKG K1000 ear speakers. The stereo amp unexpectedly performed well to drive my somewhat inefficient and low impedance Martin-Logan Aerius (89dB, 4 ohm, perhaps). Then, I transformed it into a pair of monoblocks for improved channel separation. Now, I would like to use 300b without exceeding 450-500V of B+. This is why Tubelab parallel SE monos have come to my mind for even better driving capabilities, leaving out direct coupled 300b options. When I ordered TSE boards last week, I learned that George had done wiring a board for PSE several different ways. So, I'm wondering how many people have done this, and whether or not I better leave whole one channel (or a stage) unpopulated.

I might eventually replace 5842 with trioded D3a by DIYing a socket converter, but I think this should be another topic.
  Reply With Quote
Old 28th April 2010, 06:31 PM   #5
diyAudio Member
 
Join Date: Apr 2007
Quote:
Originally Posted by ystkkmkr View Post
The stereo amp unexpectedly performed well to drive my somewhat inefficient and low impedance Martin-Logan Aerius (89dB, 4 ohm, perhaps).
Given the typical output of 300B s.e.t. amp of around 7 watts, 89db speaker may not benefit much from it. Even at 8 watts, your speaker may reach 98 db at 1 meter which isn't much.

To make this type of amp truly beneficial, you will need more efficient speakers (95db or higher). If you want to keep your speakers, you can either listen at relatively low volume only with TSE or you may want amps with higher output capacity.
  Reply With Quote
Old 28th April 2010, 06:57 PM   #6
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
Just to back up a bit, you are saying that your 2A3 SE amp (4 WPC?) performed reasonably to you ears and so you are hoping to build a 300B amp instead? Parallel 300Bs for a bit more? While I agree with Even that such an amp is not really up to the task, it's really a matter of personal taste.

It seems like one source follower in the TSE should have no trouble driving both 300B grids, but they would need to be reasonably well-matched. With the appropriate OPT, 14WPC should be possible.

I happen to have a friend that owns a pair of ML Aerius speakers. He drives them with two stereo SE amps (each bridged) and the setup was able to fill the living space of his previous home quite well. It was an open floor plan. They were beefy amps, though. Bridged they are 4 6L6GCs per channel.
  Reply With Quote
Old 28th April 2010, 07:12 PM   #7
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
OK, make that six 6L6s per channel. I remembered which amp it was...the Golden Tube Audio SE-40. Beefy indeed.
  Reply With Quote
Old 28th April 2010, 07:16 PM   #8
diyAudio Member
 
Join Date: Aug 2006
OK, I will simply wire the two TSE board channels in parallel to get 14 watts, and check how it fits my relatively low volume listening. Thanks.

Russ,

I think I will still prefer the sound produced by SET.
  Reply With Quote
Old 29th April 2010, 04:00 AM   #9
diyAudio Member
 
tubelab.com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Quote:
It seems like one source follower in the TSE should have no trouble driving both 300B grids,
Doing this way will force one bias adjustment for both tubes. This would require well matched tubes.

The prefferred method is to lift the end of one coupling cap where it is connected to the 5842. Wire this cap to the plate of the other 5842. So now one 5842 has two caps connected to it. This tube is now the driver for both output tubes. the other 5842 can be removed.

You can tie the plates of both output tubes together through a common OPT, or you can use two OPT's with their secondaries paralleled
__________________
Too much power is almost enough! Turn it up till it explodes - then back up just a little.
  Reply With Quote
Old 29th April 2010, 08:14 PM   #10
tomchr is offline tomchr  United States
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Greater Seattle Area
Do you need a different OPT, though? The effective Rp of two tubes in parallel would be half that of one tube so it would make intuitive sense that the OPT primary impedance needs to be lowered by half as well.

I can't quite wrap my head around how the load lines would look like for the two output tubes in parallel. Could someone shed some light on this?

~Tom
  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
Why not invert the Tubelab SE board? BillEpstein Tubes / Valves 11 27th October 2014 06:10 PM
Tubelab SE vs Simple SE Pez Tubelab 25 29th October 2011 03:16 AM
What is the dimentions of the TubeLab SE board??? djn Tubelab 2 2nd March 2010 12:37 AM
Second Tubelab Simple SE board done budmaestro Tubes / Valves 0 24th July 2008 01:18 AM
Difference btw SE and PSE. protos Tubes / Valves 61 13th January 2004 07:03 PM


New To Site? Need Help?

All times are GMT. The time now is 03:35 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