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-   -   Pyramid-IX monoblock, 200W from 4x GU-50 (http://www.diyaudio.com/forums/tubes-valves/224306-pyramid-ix-monoblock-200w-4x-gu-50-a.html)

Wavebourn 25th November 2012 10:57 PM

Pyramid-IX monoblock, 200W from 4x GU-50
 
Hi!

I am building a prototype of the amp, it will be monoblock, 200W output, 4xGU-50.
I have a dilemma, which side should be the face, with front panel?
Usually monoblocks have short face. But if to make the front panel on the long side it will be 19" rack mountable. Which road should I choose?

The front panel will contain only power switch and volume control. Rear panel will contain power socket, fuse, output binding posts, RCA and XLR sockets, RCA-XLR switch.

https://sphotos-b.xx.fbcdn.net/hphot...66126426_n.jpg

https://sphotos-b.xx.fbcdn.net/hphot...10241521_n.jpg

Bigun 25th November 2012 10:59 PM

Wow, this is an interesting amp

With the layout you have chosen, I vote for short face as the front, then when you look at it you see row of shielded tubes and behind a row of monsters!

Ejam 25th November 2012 11:05 PM

200W Amp Schematic?
 
Wavebourn

Any chance of a schematic or a description of your new creation?

Wavebourn 25th November 2012 11:15 PM

Quote:

Originally Posted by Bigun (Post 3256583)
Wow, this is an interesting amp

With the layout you have chosen, I vote for short face as the front, then when you look at it you see row of shielded tubes and behind a row of monsters!

They will not be shielded, I just put sockets to see sizes. One will be cat's green eye.

If to make the face short It would be better to put input sockets on the front panel, but power switch on the rear one.

Quote:

Originally Posted by Ejam (Post 3256590)
Wavebourn

Any chance of a schematic or a description of your new creation?

Sure, no problems. Everything will be in public domain with disclaimer, "800 Volts kills!"

May be I will sell PCBs, if somebody wants.

AJT 25th November 2012 11:55 PM

can you tell part numbers of those Edcor's please......

Wavebourn 26th November 2012 12:03 AM

Quote:

Originally Posted by Tony (Post 3256633)
can you tell part numbers of those Edcor's please......

Special order for power transformer. Output transformer is 4k2 for 100W from 20 Hz. From 40 Hz it will work nice for 200W, but I should try first. CXPP-100-MS-4.2K

AJT 26th November 2012 12:18 AM

thanks, i like the beige colored traffos.....

nottolkien 26th November 2012 01:40 AM

So, I am curious. Will this be pentode operation of the ordinary sort, or incorporate some of your Schade magic? I suppose what I am asking is, Can you give some basic circuit description? I have read more than a couple of threads regarding the gu-50. I have noticed that you have put quite a bit of time into developing circuits with this valve and will follow this thread. GU-50...Wavebourn...these two are always found together, it seems.:cheers:

rotaspec 26th November 2012 01:48 AM

Wavebourn, I have been meaning to ask about the GU-50 sockets. Is it necessary to have all the metal support pieces, or can they be removed to make a more "normal" looking socket? Thanks, gary

Wavebourn 26th November 2012 01:48 AM

Yes, it will be in pentode mode, with local feedbacks across output tubes. The difference from previous Pyramids, MOSFET followers to drive output tubes, and 2 tubes in parallel for twice higher power. However, the power will be rated for frequencies from 40 Hz, instead of 20 Hz, but it is plenty, since such amps either drive Magnepans at homes, or concert line arrays. For subs (frequencies below 40 Hz) I believe class D amps are better.

I would not suggest to remove all that "extra metal" from sockets: pins are thin, and key is on the glass, so it is easy to insert tubes wrongly damaging the amp.


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