Mellotronists

ferrograph@... wrote:

> << Alternatively, any recommended changes to the ua741 design? >>
>
> I can't believe what I'm reading- was there really a version of the pre-amp
> based on a 741? I only ever saw these things being used in fuzz-boxes.... if I
> could lay me hands on the pin-out, I'd recommend a drop-in replacement.
> whatever, there are many superior op-amps that would give better audio performance
> than a 741; the tl071c & the ne5534 have turned up in many high-end audio
> devices including studers & neves.....
>
> duncan/1098 (no hiss, no hum)
>
> p.s. ta, ken, for the write-up. some nice pics on y'r site too.

  ------------------------------------------------------------------------

Greetings Duncan and group,

Yes , the PML 1/2 in later M400's, EMI-400's and MK-V Trons
used the ua741 op-amp chip.  BUT.....only in the line-amp.
Meaning that the preamp circuit was unchanged.
Any pin-for-pin repl. IC prob. wouldn't yield a better sound,
because the IC wasn't part of the signal ampl. process .
I can check pinouts for you. Pls. email me privately......

Jimmy Pishock's M400 in Philly-2001 had ua741 , and Ken L. / I
saw one inside EMI-400 #3 last week in New England.

Too bad  I couldn't see you and RMI in Philly recently.
Sounds like you guys had fun !

Cheers,  Jerry Korb  ( a slight whistle in the ears...."Tronnitus" perhaps ?)