PERREAUX E200 clone

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SteveH
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#1 PERREAUX E200 clone

Unread post by SteveH »

This is my ongoing Perreaux clone project. I won an auction some years ago on the local auction site for a damaged blank pcb, power xformer and genuine factory schematic drawing. Originally I had no intention of building this, the xformer was what I wanted. Several years on I thought why not? I was never a fan of the early amps, e.g. 1850 etc but had never listened to a later model. The case work is all my own work, the heatsink sections were recovered from scrapped inverter welders. (My day job is repair of welders, plasma cutters and various CNC lathes,mills and machining centres.) I am fortunate to own a medium sized geared head mill drill which took alot of the ballache out of the case work. The pix was taken early 2015 I think during a bench test. It has a nominal rating of 200W/8ohm per channel,but in typical Perreaux fashion delivered in excess of 300W/8ohm. I need a better audio gen to get a true distortion measurement, what I got was basically just the sig gen residual to 50kHz. Sorry about the small size of the pix, am struggling with resizing. I would like some advice on max file sizes and how to. Thanks.
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jack
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#2 Re: PERREAUX E200 clone

Unread post by jack »

Very, very, sweet. Just love Perreaux in all its incarnations...
Vivitur ingenio, caetera mortis erunt
mainframe
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#3 Re: PERREAUX E200 clone

Unread post by mainframe »

Nice work! hope you got it finished and enjoy it! Any chance you still have the schematic? Been looking everywhere for one. My E200 here has some rather large dc offset issues, that the dc offset trimpots cant solve..
SteveH
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#4 Re: PERREAUX E200 clone

Unread post by SteveH »

Hi Charlie, yes, I still have the schematic. I will dig it out and see what the differences are between the two.
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izzy wizzy
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#5 Re: PERREAUX E200 clone

Unread post by izzy wizzy »

Lovely work. My first commercial amp was a 2150b.

Litphoto on android is great to resize pics. Aim for <200k file size and it's usually fine.
mainframe
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#6 Re: PERREAUX E200 clone

Unread post by mainframe »

Thanks Steve. I am in awe of your casework!
SteveH
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#7 Re: PERREAUX E200 clone

Unread post by SteveH »

Hi Charlie, had a look at my schematic, it is identical to the one on the HiFi Engine site. The only difference I could see is the is the change of value of the nfb resistor which is noted on the schematic. The rail voltages on the drawing are for the E2000. Out of interest, what are the values of the offset voltages you are measuring. I should post a few more pix of the nearly finished amp. One change I did make was to use BF469 and470 transistors in the 2nd diff pair and the current mirror as the originals are run to close to their max dissipation for reliability in my opinion.
SteveH
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#8 Re: PERREAUX E200 clone

Unread post by SteveH »

On another note, are we 3 (myself, izzy and mf) the kiwi contingent on audio-talk? As we live in reasonable proximity to each other, perhaps we should arrange a meetup for coffee and lunch in Kaiwaka or Wellsford someday.
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izzy wizzy
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#9 Re: PERREAUX E200 clone

Unread post by izzy wizzy »

I didn't pick up on that re locale 😁. A visit to a friend in Wellsford 40+ years ago got me into all this nonsense.
mainframe
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#10 Re: PERREAUX E200 clone

Unread post by mainframe »

SteveH wrote: Sat Sep 10, 2022 11:33 pm Out of interest, what are the values of the offset voltages you are measuring. I should post a few more pix of the nearly finished amp. One change I did make was to use BF469 and470 transistors in the 2nd diff pair and the current mirror as the originals are run to close to their max dissipation for reliability in my opinion.
Bingo. I was getting 170mV in one channel and 250mV in the other (after taking about 3 minutes to fall from 500mV both channels). Maxing out the 20k offset trimpots got one channel down to 40mV and the other still 150mV - something still not right. Further investigation I saw hot PCB tracks right below the transistors you mentioned. Q4 and Q104 both toast. Replaced all Q3,4,5,103,104,105 with MPSA42 and 92's and installed heatsinks on them - they run HOT. But the amps back in business. 1mV both channels, and the trim pots centered-ish as it were, not pegged to one side.

Like you said, might be worth using BF469 and 470 be used as substitues for Q3,4,5.

Interesting re the hifi engine schematic - that being for the E2, shows JS50 and K135 output pairs but my E200 has J56 and K176. I suppose they substitute for each other anyway.
simon
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#11 Re: PERREAUX E200 clone

Unread post by simon »

Now that's a meet I'd like to make! Excess baggage costs might preclude me bringing anything though...
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