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Old 2nd February 2007, 08:02 PM   #1
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Thumbs up Building new GU-50 stereo amp...

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

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Old 3rd February 2007, 12:30 AM   #2
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Here is the box...

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Old 3rd February 2007, 07:18 AM   #3
felixx is offline felixx  Romania
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Hmmm...it looks good ...for now...but where is the main schematics?
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Old 3rd February 2007, 08:31 AM   #4
Giaime is offline Giaime  Italy
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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?
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Old 3rd February 2007, 05:14 PM   #5
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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:

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Old 3rd February 2007, 05:29 PM   #6
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Where did you find GU-50 sockets?
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Old 3rd February 2007, 05:32 PM   #7
felixx is offline felixx  Romania
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Please tell us about the sound comparing with triode DHT....and what topology is the main schm.
Thx.
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Old 3rd February 2007, 05:52 PM   #8
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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.
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Old 3rd February 2007, 07:02 PM   #9
rdf is offline rdf  Canada
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Quote:
Originally posted by astouffer
Where did you find GU-50 sockets?

Usually plenty on Ebay.
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Old 3rd February 2007, 10:04 PM   #10
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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.
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