Building new GU-50 stereo amp...

Wavebourn · 2nd February 2007, 08:02 PM

Here is the PS schematics. Any comments/suggestions?
300 V regulated is to power screen grids and preamps.

Wavebourn · 3rd February 2007, 12:30 AM

Here is the box...

felixx · 3rd February 2007, 07:18 AM

Hmmm...it looks good ...for now...but where is the main schematics?

Giaime · 3rd February 2007, 08:31 AM

Do I miss something in the face plate?

BTW, what are the advantages of a 2 mosfet regulator design, over a Maida regulator with LM317?

Wavebourn · 3rd February 2007, 05:14 PM

Quote:

Originally posted by felixx
Hmmm...it looks good ...for now...but where is the main schematics?

Later... A bit of patience... (C)

Quote:

Originally posted by Giaime
Do I miss something in the face plate?

BTW, what are the advantages of a 2 mosfet regulator design, over a Maida regulator with LM317?

Tell me what is Maida regulator with LM317, I will tell you what are the advantages of 2 mosfet regulator.

Here 0A2 gas discharge toob is a shunt - regulator of a reference voltage, Q2 is an error amplifier, Q1 is a source follower. Minimun of components and maximum functionality, including nice looking indicator of B+ presence. Here is the previous amp with similar regulator in the darkness:

astouffer · 3rd February 2007, 05:29 PM

Where did you find GU-50 sockets?

felixx · 3rd February 2007, 05:32 PM

Please tell us about the sound comparing with triode DHT....and what topology is the main schm.
Thx.

Brian Beck · 3rd February 2007, 05:52 PM

Quote:

Originally posted by Wavebourn
Tell me what is Maida regulator with LM317, I will tell you what are the advantages of 2 mosfet regulator.

Here's the original Maida HV regulator from National Semiconductor:

Maida HV regulator app note

These days , Q1 and Q2 might be replaced by a single high-voltage transistor, or by a power MOSFET. Simple and effective, if not state-of-the-art.

rdf · 3rd February 2007, 07:02 PM

Quote:

Originally posted by astouffer
Where did you find GU-50 sockets?

Usually plenty on Ebay.

Wavebourn · 3rd February 2007, 10:04 PM

Quote:

Originally posted by astouffer
Where did you find GU-50 sockets?

However, Soviet military originals are the best, but I was surprised by quality of Chinese sockets I bought on ePay.

2nd February 2007, 08:02 PM	#1
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Building new GU-50 stereo amp... Here is the PS schematics. Any comments/suggestions? 300 V regulated is to power screen grids and preamps. __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

3rd February 2007, 12:30 AM	#2
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Here is the box... __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

3rd February 2007, 07:18 AM	#3
felixx diyAudio Member Join Date: Feb 2005 Location: in center	Hmmm...it looks good ...for now...but where is the main schematics? __________________ "I'm glad I can build my own mistakes."

3rd February 2007, 05:32 PM	#7
felixx diyAudio Member Join Date: Feb 2005 Location: in center	Please tell us about the sound comparing with triode DHT....and what topology is the main schm. Thx. __________________ "I'm glad I can build my own mistakes."

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3rd February 2007, 08:31 AM	#4
Giaime diyAudio Member Join Date: Oct 2004	Do I miss something in the face plate? BTW, what are the advantages of a 2 mosfet regulator design, over a Maida regulator with LM317?

3rd February 2007, 05:29 PM	#6
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	Where did you find GU-50 sockets?

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