1178 FET substitute

ijr

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Hello to all!
1178 have different vca and bias circuit than 1176.
But it can be made with DOA instead of soundpath opamps
and run +/-24 PS....

Some questions to guru's:

Can BF245A be FET substitute here?
Have anyone schematic version of 1178 with "distortion trim" pot?
So-called "british mode": how can it be implemented here?
Thank You.
 

flyingfader

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hi IJR,
I've been told 2N5566 /Siliconix would be a good replacement for the original DIL8/dual fet NPD5566 /National Semiconductor.

friendly

Fly
 

ijr

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Thank You Fader! :)))
Are these /dual fet NPD5566 / were used in 1178?
Schematic shows dual fet q7 and anything more;
one 1178 I repaired year or more ago
had strange numbering on fet (I did not find it on NET)...
 

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