30W mosfet Planteféve

[johnego]

No doubt: better than every Krell or Accu or ML and so on;-)

That's quite a statement, may I ask where this bases on?

Yeah, quite a statement

 

[cumbb]

Have some Hitachi Fets. And a repaired HMA 7500 II - there was sooo much to do;-)-;. I do think about, to remove all the boards and to build a little SE into this case. Should I use the Hitachis - and replace by actual Fets, and report about the differences - I shouldn't be at all surprised, if a lot hearsay about the Hitachis?-))) I am a little bit motivated;-)))

... and to give away. Birthday of a friend?
The original one is unaudible: sluggish pulp, or so;-)-;

 

[huggygood]

Have some Hitachi Fets. And a repaired HMA 7500 II - there was sooo much to do;-)-;. I do think about, to remove all the boards and to build a little SE into this case. Should I use the Hitachis - and replace by actual Fets, and report about the differences - I shouldn't be at all surprised, if a lot hearsay about the Hitachis?-))) I am a little bit motivated;-)))

... and to give away. Birthday of a friend?
The original one is unaudible: sluggish pulp, or so;-)-;

we can not resist
The Zenotron

and the ZCA from mark houston

 

[cumbb]

Yes;-)
Great!

And that without a board!
And without complementary-parts/pair;-!!! (Just ONE complementary-parts-stage and the result is noise - THD, TMD is (nearly) not of interest for the ear, for listening.-)

..."statement"-)

 

[johnego]

And a repaired HMA 7500 II - there was sooo much to do;-)-;. I do think about, to remove all the boards and to build a little SE into this case. Should I use the Hitachis - and replace by actual Fets, and report about the differences - I shouldn't be at all surprised, if a lot hearsay about the Hitachis?-))) I am a little bit motivated;-)))

HMA 7500 (MK1) is as simple as the original Hitachi 1969, but not better or equal. HMA 7500 MK2 is complicated, Goldmund is better (with more focus on power supply).

 

[cumbb]

Goldmund is Classe D? Which chips? Or just analog A/B, complementary...-)

 

[johnego]

Goldmund has similar topology with the HMA7500MK2. JFET input, lateral complementary output with dedicated small driver.

 

[mlloyd1]

Why gut a working HMA7500 MK2?
It's a pretty good amp.

mlloyd1

 

[cumbb]

#4244 ff.-)))
JLH 10 Watt class A amplifier

 

[huggygood]

I just made a nice find on the second-hand market, so I'm resuscitating this thread for the second time. 😁
the rest in photos to come when he is at home.