50w Single-Ended BAF2015 Schade Enabled

[Ben Mah]

Or try this by ZM:

The Singing Bush

 

[Itsmee]

I've thought about the Singing bush, still undecided... If the Semisouth is a pinpoint machine in the Babelfish ᄅſ, and ZM seemed to prefer the IRF, it seemed a natural progression to the THF-51s.

 

[Zen Mod]

I never had intention to leave message about preferring IRFP in said amp

I have no preference ........ simply not having that amp in use

sadly or not , I have just one pair of ears and finite number of chambers , in which I can put A class amp

 

[Itsmee]

Thank you for the clarification ZM.
OK, moving the Babelfish ᄅſ down the build list and the Schade back to the top

 

[pinholer]

I got one amp up and running today. Everything went smoothly, no excitement. Except for my heart.

The THF-51S is runnng at 2.2 A, Vgs = 35.7 V, with bias of -4.10 V.

I hooked the amp up to a test speaker and it is now playing my favourite radio station, CBC (Canadian Broadcasting Corporation). No unusual behaviour to report (with the amp, that is). Tests will come later.

 

[Ben Mah]

 

[Soundhappy]

Bravo Pinholer

 

[Zen Mod]

edit: why's that in Schade thread?

 

[pinholer]

You're right, Zen Mod. No Schade, although it is a single-ended BAF2015 design, so it's kind of appropriate.

 

[Soundhappy]

..I listened for circa 2 hours. My impresssion in short words is:

in this configuration it seems to sound more 'precise'. This is the best word I can find for my impression. Especially in the mids and highs.

All the musical information appears - nothing is missing. Bass is really good and controlled. But the mid to highs seem to be more accurate/precise.
The other difference to me is the soundstage and impression of room has changed (seems downsized). It seems no more so 'airy' and completely 'uncoupled' from the loudspeakers anymore.

But these are first impressions. And I did not play at the settings of the B1 NUTUBE pre.

I have very similar experience with connection to CCS point D.
Amazing how little 0.1R resistor can make such audio perception difference.
Greetings

 

[cubicincher]

to Soundhappy #1110

Hello Soundhappy,


it's a great experience I have with this amp. Great chance Nelson Pass gave to us.


Thanks for your hints, Soundhappy!


The journey into sound continues....


Greets
Dirk

 

[Soundhappy]

..it's a great experience I have with this amp. Great chance Nelson Pass gave to us....The journey into sound continues....

Any better sound if reversed or not reversed speakers polaritys with CCS at D connection ?
Very adjustable pre & power amp combo!
Thanks again to Mr. Pass for excellent BAF 2015 talk and tech documentation slides

 

[cubicincher]

to Soundhappy

I prefer reversed polarity a bit more than the 'normal' way.


Dirk

 

[Soundhappy]

OK Thanks Dirk

Have a good time

 

[alheiz]

Untested DRAFT PCB layout for comment. It will cost me the same to buy two boards as it will six, so I'll donate and ship two pairs to anyone interested in helping to prototype the hockey puck "sh*t amp."

Hi
Some PCB Gerber file or PCB for Singing Bush AMP?
God bless

 

[cubicincher]

to alheiz #1115

Hello alheiz,


you will have to contact ZenMod. He made pcbs.


Change to his thread: The Singing Bush


The Singing Bush


Greets
Dirk

 

[MEGA_amp]

Input Transformer Connections

Trying a p2p version of this amp. Can someone verify or maybe a picture of their transformer connections? I've gone through this thread 3-4 times now, and I've seen it different ways...slightly confused.
Thanks

and a few gratuitious hardware shots for the heavy metal folks

 

[Zen Mod]

your sketch is OK

 

[MEGA_amp]

Excellent! Thanks ZM

 

[MEGA_amp]

IT WORKS!!

I think these heatsinks will work out pretty well. Bias supply @ 3.8V, 60V rails, 3.3A, Q1 D-GND 28V. Seems pretty stable, no motorboating...yet.