From wes@page.ca Fri Oct 09 04:35:18 2015
Subject:Re: Speakeasy vintage tube preamp schematic

The choke is likely in series with B+ as it leaves the rectifier and heads
for the tubes. Quite often as it takes this path, it will connect the
positive terminals of the two filter capacitors together. Google "pi
filter" and you will find a schematic for this very common arrangement.

Since the power supply is mostly unrelated to amp performance, I would not
expect much help from the AO28 schematic.

Wes

Sent from my iPhone

On Oct 9, 2015, at 7:20, "James Eaton j3mes.eat0n@gmail.com [CloneWheel]" <
CloneWheel@yahoogroups.com> wrote:

"Dave” wrote: < anyone here has a schematic for the Speakeasy Vintage Tube Leslie preamp.
The website has a few documents listed, and there's a schematics section,
but there's only two documents and neither one of them is it. No help from
the google.A wire broke off inside mine, and I‚d really like to know where
it goes. Mine is the 147 stomp box version. In particular I‚m interested
in the two wires coming off the choke, which is the thing that looks a lot
like a small transformer except it's only got two wires (as opposed to
four wires for the small audio transformer and six for the large power
transformer.)>

This was supposedly modelled on the output stage of a B3 (i.e. 12BH7 in
class A mode with tranny) and possibly the power stages of the Leslie 147
(class B output into a transformer), so shouldn’t be too difficult to
figure out. There is a big choke in the PSU of a 147 which might be a
clue. If you could post some photos of the inside of the overall unit,
and the front and back of the circuit boards, the group might be able to
work it out, and I’d definitely have a go. I’d be interested to know how
closely it resembles the Hammond and Leslie circuits in any case.

Cheers
James