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The 500 mW SET amp project - it's working!

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Posted on January 31, 2015 at 23:25:57
iodemus
Audiophile

Posts: 170
Joined: October 21, 2010




Members of this forum contributed with both technical advice and skepticism to my 101D/102D/REN1064 amp project, so the photo comes here. The 500 mW monoblocs feeding the Avantgarde Duo's play music with powerful performance! Distortion free, alive, open and dynamic with silent background. This is my best sounding SET amp along with the RE604. The 101D has a DHT driver which give a little more open, direct sound.

Johnny

 

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Beautiful work, posted on February 1, 2015 at 03:23:58
Stephen R
Audiophile

Posts: 1428
Joined: January 11, 2002
 You must be very proud. Love those ball shaped valves!

cheers,

Stephen

 

RE: The 500 mW SET amp project - it's working!, posted on February 1, 2015 at 05:05:34
Al Noakes
 Very nice ! Did you follow that Japanese schematic or go your own way ?

Al

 

RE: The 500 mW SET amp project - Description., posted on February 1, 2015 at 08:05:10
iodemus
Audiophile

Posts: 170
Joined: October 21, 2010



Hi Al,
The voltages and operating points are kept. No feedback. Each filament have separate pwr. supply with Lundahl chokes. HT supplies are my design, RGN1064 rect. tube followed by C-L-C-L-R-C filter. No electrolyics, only film caps except Black Gates for the cathodes. I will make a schematic later. The amps are dead quiet, no hum/noise. What surprise me is the performance of these tubes which orginate from 1919. (Mine are from ca. 1925 with an expected lifetime 40.000 hours) Listening through HQ material, they are even more detailed/lively/dynamic than my reference until now, the RE604 SET amps. That is probably due to the direct heated driver tubes. There is obviously a good synergy with the Avantgarde Duo's too.

Johnny

 

+1 (nt), posted on February 1, 2015 at 11:02:06
Tre'
Industry Professional

Posts: 17293
Location: So. Cal.
Joined: February 9, 2002
 ,
Have Fun and Enjoy the Music
"Still Working the Problem"

 

Craftsmanship! , posted on February 1, 2015 at 13:00:15
Mossback
Audiophile

Posts: 1871
Location: Washington, the State
Joined: November 17, 2001
 I admire your craftsmanship they look like a work of art.
It would be so cool if there were more speakers that a small amp could drive.

 

Very, very nice!, posted on February 1, 2015 at 15:48:16
Triode_Kingdom
Audiophile

Posts: 10041
Location: Central Texas
Joined: September 24, 2006
 Congrats, it's very rare that something of that caliber shows up here. Is that top panel polished aluminum or something else?

 

RE: Very, very nice! (102D/101D/RGN1064 SET amps.), posted on February 1, 2015 at 22:30:20
iodemus
Audiophile

Posts: 170
Joined: October 21, 2010
 In my last SET amps I have used 3 mm brass, polished and nickel plated.
Not the easiest or economical, but I think the old tubes and the musical result deserve the cosmetic. Wish you could hear they play, they work perfect and better than I had expected. The tubes have a history back to 1914, mine are from 1925 and have an expected lifetime 40.000 hours. Not bad?

Johnny

 

RE: Craftsmanship! , posted on February 1, 2015 at 22:42:27
iodemus
Audiophile

Posts: 170
Joined: October 21, 2010
 Thanks. May be they can control the 104 dB Klipsch Belle or -horn.
There are many high-efficient horn speakers available.
Now I understand fully the amazing synergy in small SET amps and big horns.

Johnny

 

RE: Very, very nice! (102D/101D/RGN1064 SET amps.), posted on February 2, 2015 at 13:25:18
Triode_Kingdom
Audiophile

Posts: 10041
Location: Central Texas
Joined: September 24, 2006
 Interesting you should say that. Nickel polishes really well, and I've been thinking about it for the aluminum pieces I make. Maybe I'll give it a try, rather than reassembling my anodizing system. The sulphuric acid and other chemicals are a pain to deal with.

Yes, I'll bet the sound is superb. Those are also the best looking amps I've seen in some time. Really a great job!

 

RE: The 500 mW SET amp project -The schematic., posted on February 17, 2015 at 10:51:55
iodemus
Audiophile

Posts: 170
Joined: October 21, 2010



The schematic - For the Asylum members.

The monobloc amplifiers are named Geiru-Chan after my son.
He was called so by the japanese when living in Nagasaki with my family. His real name is Geir which is a Norse wiking's name meaning spear or the tip of the spear.

Johnny

 

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