Pavel Dudek's (Upupa Epops) amplifiers II

[PMA]

Well - I meant input transistors (.. devices)

 

[Page.P]

Sorry about misunderstood. There are for this moment BC549C/559C transistors. I'm going to use jFets 2SJ74/2SK170 if I'll find same free time...

 

[Upupa Epops]

I do not sleep, Jacco...new ones are on the way....

 

[Upupa Epops]

Precise work, Page P....nice to see baby like this... ...tell to guys something about sound.....

 

[Page.P]

Upupa do you mean TYA? Or some new DPA?

 

[PMA]

The new amp is a TOP SECRET. It has not been disclosed even to me during our last session in Trutnov. Pavel is afraid of me to compete

 

[Page.P]

Some kind of rivalry is health

 

[PMA]

Sure, we respect each other, and we are good friends. This is rare and valued.

 

[Upupa Epops]

No, I mean " good old mama ", 330....

 

[Page.P]

Well - The sound is much more open then I have ever heard. I am happy that I can write that the sound is really natural at last.

The music is as excellent as this amplifier looks like!

And Upupa sorry, but I must corret you, not good but EXCELLENT!

 

[erka]

I'm listening Upupa epos's amplifier DPA380 for nine years. And sound? I have never listened better amplifier...

 

[Page.P]

Because you have never heard DPA330

 

[Ultima Thule]

This is a successful end of the new 330 which I have finished with aid of Mr. Dudek himself.
I would like to thank him a lot for his willingness and time which he devoted to me and above all for the great amplifier which he had constructed.
Thanks a lot!

Very nice Page.P!

Very unusual way of cooling the TO-3 Hitachi devices you have there, how thick is the aluminium plate on which the TO-3 are attached to?
I had a bunch of those TO-3 Hitachis but changed with a guy from NZ and got 1,5 times as many of the 2sj162 2sk1058 in exchange, some are crazy in those old cans.

Cheers Michael

 

[raypalmer]

Someone please tell me where to buy all these lovely pcbs!!

Want!

 

[Page.P]

Ultima Thule: The plate is 5mm thick, but it isn't made from aluminium. It's from nickel-plated copper

 

[Page.P]

Sorry about invisible picture of DPA330.
This should work better:

An externally hosted image should be here but it was not working when we last tested it.

 

[Page.P]

And my DPA380 on old PCB:

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[syn08]

Great pictures, very proffessional

 

[Page.P]

Thanks

 

[Federmann]

Regarding parameters, this was DPA380 THD vs. frequency, 8ohm load, 1dB below clipping:

I judge the quality of amplifiers by delays 100kHz, which is to please at 100kHz the amplifier output stage?

Thank