Paragon System-E PS schematic needed - diyAudio
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Old 26th January 2011, 03:19 PM   #1
BigE is offline BigE  Canada
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Default Paragon System-E PS schematic needed

Does anyone have a schematic for this power supply?

Failing that, can someone fill me in on the specs of this capacitor:

Sprague 36DX 540-450 WVDC 7452L

google reveals only that it is discontinued, but no specs ie, I have no clue of it's value.

Similarly, there is a quad cap in the unit that is unmarked.

The general layout of the power supply appears to be a CRCRC filter. (C1, R1, C2, R2, C3), with the two C2 R2 C3 sections attached to the initial CR in parallel.

C1 is the Sprague, the quad cap holds the other 4 caps used in the parallel CRC sections.

Each of the of the C2R2C3 sections powers one channel.

The voltages are approx. V(c1) 420, V(c2) 380, v(c3) 290.

the transformer is a 300V AC, with full wave bridge.

The PS powers a total of 6 12ax7's, 3 per channel. According to the sylvania sheet, the Plate resistance of a 12ax7 at 250V is 62.5K Ohms. If memory serves, R1 looks like 30K, R2 6.8K.

Problem is, I can't model this using the duncan amp simulator due to the parallel CRC section.

Any idea on what the quad is or better yet, SHOULD be?

Thanks for any help...
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Old 14th July 2012, 03:51 AM   #2
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Default Paragon System E

I own a Paragon System E also. I worked for an audio company back in the '70's and '80's and am pretty sure I have a blueprint for a system E (they came with them back then). Do you still need the info?
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Old 9th September 2012, 11:54 PM   #3
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Quote:
Originally Posted by voyageur14 View Post
I own a Paragon System E also. I worked for an audio company back in the '70's and '80's and am pretty sure I have a blueprint for a system E (they came with them back then). Do you still need the info?
I too have a Paragon System-E, sans the power supply. Would like to build up the PS to original specs, otherwise there will be the usual song & dance to design it. If I can get a copy of the blueprint, it would be much appreciated.
Thanks.
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Old 17th October 2012, 05:56 AM   #4
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And I too can join the group of Paragon E-1 owners. This one I have has a butchered power supply, but does work. I need to rebuild the ps. One channel has really low output and is not the tubes, volume or balance pot. Would like to get a copy of the power supply schematic too.
Thanks you guys.
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Old 14th December 2012, 10:08 PM   #5
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Default Paragon Pre Amps

Does anyone still need schematic information on Paragon preamps?
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Old 27th December 2012, 06:30 AM   #6
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I need the schematic very badly. I have one of these amps I bought in Northern CA. I guess the designer, same one of the "Blueberry" from Juicy Music, lives near me, but I lost touch. My PS module blew out something a few years back but this preamp sounded good. I just wish it had a tube in there for rectification.
I need a schematic for modification very badly to get this working again.
Thanks,
Mark
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Old 20th March 2013, 05:54 AM   #7
Naidu is offline Naidu  Singapore
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Hi Paulsgear,
I too have the Paragon E pre amp and would appreciate it you could please send me a copy of the schematic. My email add is v_n-naidu@hotmail.com

Thanks & Rgds,
Nara
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Old 2nd May 2013, 04:34 AM   #8
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I have recently been sent a Paragon in need of a power supply rebuild. Quad cap?
What to do about that? The 450V cap is a 540uF I'm sure and Newark can supply one similar enough to work. The 16 V 5000uF caps can be replaced and "zip tied" easy enough. But what to with that quad cap. I thought maybe it is a tube rectifier, the case makes no sense.... I may be making new power supply(s) with modern parts, assuming you guys think this is a worthy endeavor to keep these classics alive.
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Old 11th May 2013, 05:25 AM   #9
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Default Paragon power Supply

I am going to draw one up. I broke a wire while replacing caps. Now I am not certain where it goes. It should make sense after a drawing. After all it is just a simple tube power supply. I believe there is only one voltage tap on the low voltage circuit (heaters) and 4 voltage lines for the HV supply for the tubes.
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Old 28th May 2013, 04:19 AM   #10
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Default Paragon power Supply

Completed the re-assembly with new caps. Used 560uF 450V and a 20uF x4 rated at 350V and new caps for the plate heater. Pictures and drawings are important since it is all point to point wire. No markings at all on the original quad cap, but 2 sections measure 50 ish. It forms a simple pie circuit with 33K and 5K resistors. This preamp has too much gain for most systems, but the sound is pretty good.
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