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Official M2 schematic
Official M2 schematic
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Old 28th January 2018, 12:58 PM   #2401
Zen Mod is offline Zen Mod  Serbia
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Official M2 schematic
you have a problem with your regs , too wimpy for current nvolved

also , 10K in bias network is way too small , resulting in 5K or so input impedance of OS , further divided to buffer via xformer ....with square of voltage ratio

if xformer is having 4V/V , that is 5K/16 , taking too much burden to small toshibas

so , increase values in bias network
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Old 28th January 2018, 06:41 PM   #2402
blackdod is offline blackdod  Europe
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Thanks ZenMod.

I use a similar PSU that F5ha so I don“t think that the psu is the problem. I measured around 165mA for rail. It“s not much

I use 3.3R on R16 and R22 and I measure 0.525Volt, a Bias around 160mA so this is ok.

What value would you recommend increasing the Bias network? Do you mean R6 and R24?
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Old 28th January 2018, 06:48 PM   #2403
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open new thread , give us necessary info and we will solve your problems

post reg schematic , and maybe even picture or two of amp itself
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Old 29th January 2018, 09:30 PM   #2404
blackdod is offline blackdod  Europe
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Quote:
Originally Posted by Zen Mod View Post
open new thread , give us necessary info and we will solve your problems

post reg schematic , and maybe even picture or two of amp itself
Thanks Zen Mod.

You are right, I changed r6 and r24 for 20K and.... tachannnnn

Now both rails works with +-15volt and a very stable offset but the Bias down from 160mVolt to 36mVolt. Maybe is a better idea change R16/22 ???

I“ll open a new thread tomorrow for share all information/pictures/schematics about this amp.
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Old 9th February 2018, 05:59 PM   #2405
JimT is offline JimT  Canada
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If anyone has a spice circuit for this I would appreciate a copy. I will need the model for the transformer and the 4N35.

Thanks
Jim
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Old 10th February 2018, 09:07 PM   #2406
flocchini is offline flocchini  United States
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Default Toshiba 2SK1530 / 2SJ201

Completed my M2 changeover

Added Toshiba 2SK1530 / 2SJ201, reduced source resistors to .33 ohms and 0 ohms at R11. Using Tea Bag boards

Power by umbilical cord.

Nice involving sound with wide and deep soundstage. Great detail without fatigue

Highly recommended.

Best

Bob
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Old 10th February 2018, 09:29 PM   #2407
Zen Mod is offline Zen Mod  Serbia
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again ugly sinks and motor run caps for signal



(what's Iq now?)
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Old 10th February 2018, 10:19 PM   #2408
flocchini is offline flocchini  United States
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Iq is approx 1.7A

I had to use those Obbigato caps I had in a box

Maybe one day I will replace with Simlic II and your favorite bypass
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Old 10th February 2018, 10:36 PM   #2409
Zen Mod is offline Zen Mod  Serbia
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OK

everything is forgiven , seeing those sinks

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Old 11th February 2018, 08:50 AM   #2410
chede is offline chede  Germany
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Official M2 schematic
Quote:
Originally Posted by flocchini View Post
Completed my M2 changeover

Added Toshiba 2SK1530 / 2SJ201, reduced source resistors to .33 ohms and 0 ohms at R11. Using Tea Bag boards

Power by umbilical cord.

Nice involving sound with wide and deep soundstage. Great detail without fatigue

Highly recommended.

Best

Bob
+1 for the same combination.

In my case built on JPS64 boards, with PSU in the same box, and I have a WIMA MKP10 for C2 and Elna Silmic II 3300 µF for C3 (bypassed by 1 µF MKC ERO1860).

My M2 runs with Iq of 1.81 A (Rails at +/- 24V).

Best regards,
Claas

Last edited by chede; 11th February 2018 at 08:53 AM. Reason: Added info on bypass caps for C3
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