[Don Pearce[_3_]]

On Sat, 03 Sep 2011 19:27:48 -0500, flipper wrote:

On Sat, 03 Sep 2011 15:34:47 GMT, (Don Pearce) wrote:

On Sat, 03 Sep 2011 11:21:52 -0400, Don
wrote:

In article 2edeb104-6024-43e8-9749-
, says...
On Sep 2, 8:03*pm, Don wrote:
please see the schematic in alt.binaries.schematics.electronic
under "1st try kt88 amp"
it is a Mullard 5-10, Pat Turner, andwww.diytube.cominspired mash-
up.
-Don

Can't see it... could you post it somewhere else that is universally
accessible?

try
http://mysite.verizon.net/vze11z1rm/

You won't be hearing much until you sort out the connections to that
output transformer.

d

Well he has, sorta. Just not a 'speaker' connected.

He doesn't have a suitable transformer model. What he needs is a 5 tap
primary

A-Plate, A-UL
CT
B-Plate, B-UL

and 4 tap secondary

GND, 4 Ohm, 8 Ohm, 16 Ohm

So he's taken two 1-1 transformer symbols and jury rigged the wiring
to 'sorta look like' what he doesn't have.

Imagine the core extends through both so it's 'one' transformer. The
1-2 CT connection should be clear. Then imagine another set of coils
connecting the middle 5 to 6 so it's a continuous winding from the
bottom 6 to the top 5, which should be renumbered so they don't
duplicate.

He's taking feedback from the 8 ohm tap and his zobel is on the 16 ohm
tap. The 4 ohm tap is 'open', unless one were using 4 ohm speakers in
which case that's where they'd connect.

The open circuit output tap needs a connection to the other half of
the transformer - otherwise there is no circuit.

d