Arny Krueger wrote:
"Dave xxxx" wrote in message


Andy Evans wrote:

Dave xxxx wrote:

The 4PS1 valve is used in a headphone amplifier

But I can not find it or anything like it.


Has anyone any ideas ?

ta in advance

This is an unusual name for a valve. Is it Russian or
Chinese? P is R in russian, but Russian doesn't have an
S.

Its fitted to many Chinese head(phone) amplifiers.


There may be a typo in the OP, as 4P1S is a recognized tube type.

The 4P1S appears to be a loktal triode.



I have been trying to find references, I think Arny is right, looking
around I think they could be the same as 4N1N which are not that common
either. I did find a reference that made me think they were pentodes though.

--
Nick