A good tube for my SE 5K-8 OPT's

[Troncones]

I have a set of Transcendar OPT's I bought to use in a SE 6BQ5 amp. Now I feel they may be over kill for 6BQ5's (I'm happy with the Edcor's) and I'm looking for another application.

Any suggestions?

 

[rvrazvan]

well . give us some date abput the xformer . wats, core size, max current etc

 

[Troncones]

The spec's are 10Watt, 100ma. Transcendar says both of these are consiverative.

 

[tomchr]

300B SE would be sweet. Or 2A3. Or for the more budget conscious, a 6LU8 spud...

~Tom

 

[andyjevans]

Second the 300b SET - perfect and many designs here

 

[radiostar]

307A / VT-225 very good tubes for audio amplifiers

I made one hi-end SE amplifier with 307A and 10Y and it plays really good!!!


I also started one low budget tube amplifier with VT-225 valve but still didn't finish it

Good luck!!!

 

[the_manta]

I use exactly those OPTs in my 1625/VT100 Amp. (same as 807;QE06/40;Г807)
See here
Circuit is old fashioned but with local feedback. At least not mainstream like the boring 300B ;-)

 

[Ty_Bower]

I have a set of Transcendar OPT's...

Those are the output transformers I used on my Tubelab Simple Single Ended amplifier. They are fantastic with triode strapped EL34, 6L6, or KT88 types.

http://i69.photobucket.com/albums/i43/Ty_Bower/Simple SE/P1100376.jpg
http://i69.photobucket.com/albums/i43/Ty_Bower/Simple SE/P1100484.jpg

 

[mach1]

I use exactly those OPTs in my 1625/VT100 Amp.

Hi manta, nice amp.You might want to try running the 1625 cathode resistor directly to ground with the capacitor remaining as is. That way only AC goes through the secondary and you have no DC offset at the output terminals.

 

[boywonder]

I know you want to roll your own.....but....

Tubelab SE (45 or 300B) or Tubelab Simple Single Ended.

 

[mashaffer]

5K is a very popular one it seems. Many possibilities including 6EM7 and the compactron equivalent who's number escapes me at the moment.

 

[the_manta]

Hi manta, nice amp.You might want to try running the 1625 cathode resistor directly to ground with the capacitor remaining as is. That way only AC goes through the secondary and you have no DC offset at the output terminals.

Thanks for that hint. That's a good idea, I didn't think that far. What I also wanted to do is DC coupling of the 6C8G but I hadn't enough Ub. Maybe it's time for a redesign now.

 

[Troncones]

Thanks everybody. I picked up some 2A3s and filiment Tx's at a garage sale this weekend. So for now that's the direction I'll go.

The ideal primary for this and the other tubes mentioned is 2.5K-3.5K. On the 2A3 project I'm willing to give up a little power for the benifit of reduced distortion but I would still like to find a tube that could make better us of a 5K load line.