From time to time i throw a look to check the work in progress, and if i can give an advice it is to replace the OS dual pair + drivers by a single BDV64/65 darlington pair, it s as fast as the BD203/204 + BD235/236 configuration and it hold theorically 125W TDP per transistor, of course some Sanken darlingtons would be much better but they are not cheap, not counting that some of their best parts were obsoleted for some reasons.
The two CCS for the diamond buffer should be set at something like 5-6mA at least even if you keep the OS as it is.
Last but no least a dual differential IPS is by far a better solution than the quite original one, with some care you can approach
the perfs of a classic blameless with the advantage of a true symmetrical driving stage that work flawlessly.
Anyway good luck with the remaining efforts and keep on the good work.
Greetings.
By September at the latest, I will have the time I need to pursue the 25W-Krill project further.
With the request for patience and foresight,
HBt.
With the request for patience and foresight,
HBt.
With pleasure,
I consider the concept and principle of KRILL to be absolutely trend-setting.
HBt.
I consider the concept and principle of KRILL to be absolutely trend-setting.
HBt.
Why was this user banned? Their combination of utter cluelessness and inflated and ego is hilarious! I’ve been chuckling over this thread all morning.
I could not disagree more. This amp takes 3 adj trimpots and with gain of <0dB requires very high input level making things complicated.
3 trimpots is overcomeable... 0dB is just perfect for some applications. I.e. power follower for a tube preamp, or as I plan to do, as an OPS for this preamp:
I see no complications at all!
😎 morten
No, of course Steve Dunlap's EF2.3 version can't do that, because how is it supposed to outshine itself?
KRILL
Attachments
"Ein KRILL kommt selten alleine ;-)"
A big thank you Morten, the postman has just surprised me with a letter from Norway - I'm delighted and will get to work straight away. Putting components together, assembling, soldering ... Work on heat sinks, measure ... happy with an interesting power amplifier! I firmly believe that Steve D. knew exactly what he was doing.
Wow,
I don't know what to say. The first photos will follow shortly.
greetings to you,
HBt.
A big thank you Morten, the postman has just surprised me with a letter from Norway - I'm delighted and will get to work straight away. Putting components together, assembling, soldering ... Work on heat sinks, measure ... happy with an interesting power amplifier! I firmly believe that Steve D. knew exactly what he was doing.
Wow,
I don't know what to say. The first photos will follow shortly.
greetings to you,
HBt.
@m0rten
My work account is slowly filling up ... and cannot yet foresee when I will be able to submit the first data (measurements or descriptions).
D1, 2 & 3 I put it on the soldering/back side, let's see how the thermal tracking turns out - in close contact to the heatsink.
BD203 & 204
must be sufficient for 25 watts for the time being.
We will see
HBt.
My work account is slowly filling up ... and cannot yet foresee when I will be able to submit the first data (measurements or descriptions).
D1, 2 & 3 I put it on the soldering/back side, let's see how the thermal tracking turns out - in close contact to the heatsink.
BD203 & 204
must be sufficient for 25 watts for the time being.
We will see
HBt.
Attachments
Photostory
The next round is about to begin, but first Beelzebub has to give up his wings. Does the LM385Z work correctly with the Fb pin open? For Morten this time with screw terminals - although I don't like them in an audio amplifier.
The tension rises again immeasurably.
The next round is about to begin, but first Beelzebub has to give up his wings. Does the LM385Z work correctly with the Fb pin open? For Morten this time with screw terminals - although I don't like them in an audio amplifier.
The tension rises again immeasurably.
