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 2nd December 2019, 08:49 PM   #581
lykkedk is offline lykkedk  Denmark
diyAudio Member
 
lykkedk's Avatar
 
Join Date: Dec 2002
Location: Denmark, Fredericia
Default Still hunting for some info Output -formers

I'am in doubt, what difference the two OPT's will be in real life situ?

The one's i was looking for is claimed to be for 300B's :

TTG-KT88SE - Tube output UL transformer [3kOhm] KT88 / 300B SE
Intended for Single Ended
Core type Toroidal
Ultralinear tap 43%
Nominal Power 40W
Nominal anode current 250mA
Frequency bandwidth (-3dB) 10 Hz - 56 kHz
Secondary Impedance 4 and 8 Ω
Primary Impedance 3,0 kΩ
Turns Ratio (Np:Ns) 27,39:1 (4Ω) , 19,36:1 (8Ω)
Primary Inductance Lp 39,5 H
Primary Leakage Inductance Lsp 10,88 mH
Total Primary DC Resistance 85,4 Ω
Effective Primary Capacitance 7,6 nF


The One's OldHector is using are claimed to be :

TTG-EL34SE - Tube output UL transformer [3,2kOhm] EL34 / 6L6 SE
Intended for Single Ended
Core type Toroidal
Ultralinear tap 43%
Nominal Power 40W
Nominal anode current 100mA
Frequency bandwidth (-3dB) 10 Hz - 56 kHz
Secondary Impedance 4 and 8 Ω
Primary Impedance 3,2 kΩ
Turns Ratio (Np:Ns) 28,28:1 (4Ω) , 20,00:1 (8Ω)
Primary Inductance Lp 51,2 H
Primary Leakage Inductance Lsp 0,73 mH
Total Primary DC Resistance 112 Ω
Effective Primary Capacitance 11,2 nF


I'am pretty sure the smaller EL34 version will work in this amp, but why they are claiming it to be for EL34 / 6L6 and not mention 300B etc.. Or is there something i'am not aware of?

The price difference between them are not much, so it does not matter much (within 12$)
I really hope someone can help me answering this as i am in doubt.

Rgds; Jesper.

PS. : USPS updated the shipping information of my TSE pcb to being on it's way from Copenhagen now
__________________
DCG3 Dual DCSTB, AK4490 Dual SuperDAC
AlephJ Mimi! http://www.diyaudio.com/forums/pass-...mimi-mini.html
  Reply With Quote
Old 3rd December 2019, 01:13 AM   #582
csample is offline csample  United States
diyAudio Member
 
Join Date: Apr 2017
Location: Wisconsin
After a 14 year run, the TSE must DIE!
The question on the Torodiy output transformers seems general enough that you might also get some information in the "Tubes" forum. I searched there for "Toroidy 300B" and got a few threads including this one that may be of interest (I didn't read the whole thing)

Problem - SE Class A with toroidal OT ?

Chas
  Reply With Quote
Old 3rd December 2019, 12:53 PM   #583
lykkedk is offline lykkedk  Denmark
diyAudio Member
 
lykkedk's Avatar
 
Join Date: Dec 2002
Location: Denmark, Fredericia
Thanks all.

I had a conversation with OldHector, which is using the small 100mA OPT.
They seem to work very good, and do not get hot or some.

He asked a quistion simulair to mine some time ago, which was cleverly answered by George (It was a quistion about some other transformer) :

Quote:
The transformer you listed is optimized for use at 120 mA. This means that the gap in the core (required for SE operation) is a bit wider than the same transformer optimized for 90 mA. As seen in their data, the inductance drops a bit because of the wider core gap. Other than the slight loss in inductance, it will work fine at all currents up to the maximum rating of 210 mA, but it will work best at 120 mA. The loss of inductance may make a small difference in bass response especially when a small tube is being used to drive it. The 6L6 types would be the worse case, followed by the EL34. A 6550, KT88 or 300B should work just fine with this transformer.
Also i see, that the bigger 250mA OPT, has ~20% less inductance, excatly as George described it above.

I did read a lot of stuff about this, all kind's of old stuff regarding anode current / OPT / turns ratio etc..., but it was not clear for me, that choosing a smaller OPT could actually work better (thanks Csample for kicking me in the right direction)

Thanks all.

Jesper.
__________________
DCG3 Dual DCSTB, AK4490 Dual SuperDAC
AlephJ Mimi! http://www.diyaudio.com/forums/pass-...mimi-mini.html
  Reply With Quote

Reply


After a 14 year run, the TSE must DIE!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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY'er of the Year! CanAm Man Pass Labs 2 2nd January 2015 11:26 PM
Happy New Year..."Happy New Year" to all . Best Wishes and God Bless Albert Walfie Fixer The Lounge 12 1st January 2012 12:02 PM
Baaa...New Year same as the Old Year T in AZ The Lounge 36 7th January 2010 10:06 PM
xp20 year oct 08/xp20 year 2009 GUSTAV1966 Pass Labs 2 12th December 2009 05:26 PM
Best New Year Yonnat Pass Labs 0 1st January 2004 12:02 PM


New To Site? Need Help?

All times are GMT. The time now is 07:45 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki