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MP-1 V2: FET Questions

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Fdesalvo:
Hi, all.

Long time lurker. So glad this site iis back up.

Ive got a v2 MP1 and am refreshing the caps and have moved on to the fets/jfets/etc. I have a couple of questions due to my ignorance of all things FET and the dearth of info for the v2 online.

1. I am unable to locate replacements for Q1/2: K364 GR91. Are these “2SK364’s” that I’m seeing referenced elsewhere?  I have some updated equivalents on hand (LSK170’s) if this is the case.

2. Q3/4 are MPSA92’s. I have these on hand, but is there a higher performing equivalent out there?

Many thanks for the help/education. I build all analog vacuum tube amps and do restorations on a variety of preamps, but venturing into the digital/ss realm has been eye-opening, if not exciting.

Best regards,

Frank
“Ruining good moments since 1975.”

MarshallJMP:
Yes these are 2SK364 (in rare cases 363), but why do you want to change these?
Same with Q3/4, no need to change them, if they work they work.

Fdesalvo:

--- Quote from: MarshallJMP on May 10, 2018, 01:37:51 PM ---Yes these are 2SK364 (in rare cases 363), but why do you want to change these?
Same with Q3/4, no need to change them, if they work they work.

--- End quote ---

Thanks for the response. I can’t imagine how busy you are.  I’m looking for other areas to reduce background noise if possible. 

MarshallJMP:
Well you could replace all the resistors with metal film, also replace those 33µF caps on the tubeboard with 10µF except C13.

Fdesalvo:
Thank you for your advice. I’ll give that a whirl.

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