Liverpool Documents

[Ron Worley]

I decided to use the Express Layout that I had done in Visio and produce a LP version that's much clearer than what was here before. Please let me know if there are any errors!

EDIT: BOM updated 21 July 08
EDIT: BOM Rev 1.4 posted 21 Aug 08- numerous cleanup items
EDIT: Layout modified to correctly label C3 and C4 9-1-08
EDIT 21 Sept 08- Updated BOM
EDIT: 1 Nov 08- Updated BOM
EDIT: 23 Nov 08- Major BOM Revision
EDIT: 06 Dec 08- Layout and Schematic updated to reflect proper wiring of the tone stack, Presence pot, errors on EL84 sockets
EDIT: 19 Jan 00- updated BOM, little stuff.
EDIT: 3 Mar 09 Corrected Screen resistor value to 1.0K
EDIT: 29 Oct 09- BOM updated
EDIT: 23 Nov 09- BOM updated
EDIT: 06 Dec 09 New clearer Visio generated Layout uploaded
EDIT: 20 Dec 09 Corrected new layout with proper LP Preamp board values

EDIT- LAYOUT IS WRONG, NFB WIRE ATTACHES TO 8 OHM TAP, WILL BE CORRECTED!!!

[Ron Worley]

Here's the Liverpool's Voltage Chart for use in initial power up.

[jimg]

Hi Ron,
Just wanted to say how much I appreciate your time and all the effort you have put into all the files you've posted here....a BIG help!
Thank You!!!!

[jimg]

Ooops....forgot to add Tim's name in there....Sorry Tim

[smokin' tone]

Thanks guy's. Very nice work.

[Ron Worley]

I work in the Avionics world, where customers demand complete documentation... I figured this shouldn't be any different!

Ron

[jaysg]

You guys might add a note somewhere to point out that the nominal -3db down point created by R7 & C8 is roughly 480Hz and is best maintained initially. Also note that dropping the 150K down to a lower value is a method to lower the gain of the previous stage.

[Tdale]

I compared the schematic and the layout, and find something that I think might be an error. Or it might be me...

On the presence pot, VR5, the schematic show that the wiper and bottom leg of the pot, are joined, so that the bottom leg is grounded through C10.

On the layout, the bottom leg is grounded directely, not through C10.

Is it intended to be that way?

Tommy

[Tdale]

I'm also looking at the big 25W cathode resistors for the EL84's.

Seems like one of them is connected to pin 3 on one pair of output tubes, while the other is connected to pin 4 or 5 to the other pair. They are supposed to connect to pin 3 I suppose.

Also, it seems like one of the 25 resistors are not grounded, although there could be a cable that's hard to spot...

I'm not trying to be a "wiseguy"...just pointing out things that I think might be uncorrect..

Tommy

[Ron Worley]

There are a number of errors here- I copied my Express layout and forgot to make appropriate changes to the Preamp board, and perhaps others.

Let me know what other errors you find....

[fayser]

ignore

[pablogt]

The voltage chart I see is empty. Is it the same for everyone or is it just me?

Pablo

[Richie]

The one voltage chart is to use on your own amp,and put in the voltages of an amp you built. Kind of like a blank sheet to use to put in the voltages of your amp on startup.

[pablogt]

I see... Thought it would be the expected voltages

P.

[ampgeek]

I was poking around for expected Liverpool voltages and noticed that we don't seem to have a full, "typical" baseline.

The schematic provides the critical power rail values which is a great start.

Does anybody have and is willing to post up a fully completed voltage chart for reference?

Cheers,
Dave O.