New HRM build

[ic-racer]

All the control pots are in. Started wiring them:
[IMG:640:480]http://img.photobucket.com/albums/v670/ ... CF5850.jpg[/img]

[ic-racer]

Power transformer is in. Now it is starting to look like an amplifier. All these years, I thought I'd never finish it. Now the end is in sight

[IMG:640:480]http://img.photobucket.com/albums/v670/ ... former.jpg[/img]

[heisthl]

Here's a handy wiring guide:

[Colossal]

Here's a handy wiring guide:

(snort), now that is mojo. Pay attention to lead dress!

[ic-racer]

Here's a handy wiring guide:

That is what we have going on here... lots of same-colored wire...
[IMG:640:375]http://img.photobucket.com/albums/v670/ ... ches-1.jpg[/img]

[ic-racer]

Main board is almost done:
[IMG:640:480]http://img.photobucket.com/albums/v670/ ... CF5858.jpg[/img]

[ic-racer]

Cable ties and more cable ties...
[IMG:640:480]http://img.photobucket.com/albums/v670/ ... CF5859.jpg[/img]

[ic-racer]

I just discovered this clear heat shrink tubing. Makes nice covering for all those free-floating components in the preamp.
[IMG:640:480]http://img.photobucket.com/albums/v670/ ... CF5861.jpg[/img]
[IMG:640:480]http://img.photobucket.com/albums/v670/ ... CF5866.jpg[/img]
The blue wire on the far right of the OD relay board goes into the wrong hole in the picture. I found that error when putting the main board in place.

[ic-racer]

Picture before the main board goes on:
[IMG:640:480]http://img.photobucket.com/albums/v670/ ... CF5865.jpg[/img]

[ic-racer]

Darn, I see that I am missing a 24k and two 0.1 uf capacitors on the main board. I think I might go ahead and mount the main board and just solder those components in from the top when I get them.

[guitardude57]

naaa, put them in before you buckle down the board...

I don't think a solder bridge to the chassis would do much good for tone.

[ic-racer]

Very close to completion. I already checked the 12V circuit by connecting the 12V transformer to the mains through a make-shift fuse. The relays and LEDs function as they should.
[IMG:640:480]http://img.photobucket.com/albums/v670/ ... ockets.jpg[/img]
[IMG:640:480]http://img.photobucket.com/albums/v670/ ... gClose.jpg[/img]

[ic-racer]

Got the FET board finished.
[IMG:640:480]http://img.photobucket.com/albums/v670/ ... CF5871.jpg[/img]
[IMG:640:480]http://img.photobucket.com/albums/v670/ ... CF5874.jpg[/img]

[ic-racer]

First plug-in test. The rectifier and first stage of the PS are OK. I'll progressively hook up each stage and check. When it is all ok, the tubes go in!
[IMG:640:480]http://img.photobucket.com/albums/v670/ ... stTest.jpg[/img]

[ic-racer]

I fired it up and had bias problems. I found 20ACV on the bias circuit.

Look at this picture, between the two capacitors there is supposed to be a ground wire. All that is visible is the hole (faint light area; does not show up well.)
[IMG:545:640]http://img.photobucket.com/albums/v670/ ... otated.jpg[/img]

Where in the heck did the wire go?? I actually posted this picture in the link below back in 2009 showing how I made the boards. The wire was clearly there. Maybe it fell off or something. Either way, I have to take the board off and put a new one on.

http://ampgarage.com/forum/download/file.php?id=7714