On Fri, 28 May 2004 14:04:19 GMT, "JVC" wrote:

Hi Bob,

Would you be able to take some time to help me with a few questions?


Maybe you could clarify something that has me puzzled about the Fender Stage
Lead I have been working on.

I have posted a schematic to alt.binaries.schematics.electronic. (Stage
Lead amplifier Fender).

The print calls for:

Q 9,11 as 29D
Q 8,12 as 30D

The installed components were

Q 9,11 TIP29C (TI)
Q 8,12 RCA1C04

It appears to be stock unaltered from the factory, doesn't appear to have
been repaired at any time.

I am curious why they didn't use the "D" rated TIP29 as called for in the
schematic.

Should I replace the TIP29 and TIP30's with the TIP41 series, as I cannot
seem to find TIP29's or TIP30's in the "D" rating, and I have ordered the
TIP41's as per your cross reference info, thanks,

I would greatly appreciate any advice,

Regards,

Vin Collins



hi Vin
the letter suffix on the TIP series transistors, denote the voltage
rating "C" = 100V and "D" = 120V. the "D" rated ones are specified in
the original drawing as you say.
the RCA parts if my memory is correct were rated 100V.
therefore i recomend you use the "D"s if you can source them.
but in my experience the "C" rated devices will be fine in your
application.
one further point is to get "branded parts from a reputable
manufacturer
regards
bob