2nd Gen Build Started (that didn’t take long…)

[Raoul Duke]

When you say “relay supply board ground” do you mean break that black wire and connect it to the HV ground lug enroute to the DIN; or connect it to where the ground from the rectifier board passes through the relay supply board (also enroute to the DIN).

Break the long black wire and connect to the relay PS/main ground on the way to the pedal/manual switch, or, use that chassis hole over by the pilot lamp for a ground lug and make that a dedicated relay PS ground like your 102.
It looks like the cap on the pedal manual switch is in the wrong place too. It should be connected from the center lugs to the ground side.

Speaking of the DIN, Isee it doesn’t have solder lugs. Is it a good idea to try and drill holes in the terminals or will tack soldering the wires in be good enough?

Got a link to a data sheet or a photo? Maybe it has tubular solder lugs where you insert the lead and fill with solder?

I have one of those board holders too. Very useful tool.

Understood on the ground wire.

I have the connections on the pedal manual switch exactly as Tony’s layout minus the co-ax. So it should be across both center lugs to the right side top?

I’ll look for the data sheet, but what you describe is what it looks like. Didn’t think of using it as you describe; but now looking at it - what you say makes perfect sense. Learning again!

Thanks again!

[Raoul Duke]

Found it on sale so I rewarded myself. I considered it an indulgence but soon learned it really is handier than I expected.

Look on the bottom of this web page to see how I modified mine to handle longer boards...

https://sluckeyamps.com/cradle/cradle.htm

Will do, thank you!

[martin manning]

Question: Does your footswitch XLR have a dedicated ground pin that connects to the body or does pin 1 connect to the body? Really I'm wanting to know if your relay power has a ground at the jack or not.

[Raoul Duke]

It looks to me like the solder lug at the top is a dedicated ground pin (see photo and data sheet for C3F):

[Raoul Duke]

And here’s a close up of the manual/pedal switch:

[martin manning]

OK, great. See here: https://ampgarage.com/forum/viewtopic.p ... 80#p462380

[erwin_ve]

It looks to me like the solder lug at the top is a dedicated ground pin (see photo and data sheet for C3F):

Correct, the lug that looks different from the others is connected to the body.
If you use a washer with tooth(don't know the English name) when mounting the C3F it punches right through the powdercoating and you don't need a extra wire.
That's the way I did it and works fine.

Erwin

[Raoul Duke]

Thanks Erwin!
I used keps nuts on the mounting screws - same principle?

[Raoul Duke]

I have an older-style (6v non-LED) pilot light like the photos in the 2nd gen file thread. What’s the preferred way to feed that light? Heaters from PT to V5, then back to the light? Vice-versa? PT to Terminal strip to distribute the 6.3v both ways? Something else?

Option 1.

Do the wires from V5 back to the lamp need to be 18 AWG? I’ve searched this both here and elsewhere and it seems to be evenly split from what I’ve found. What’s the best practice for this?

Also - trying to nail down the power cord. I understand the routing, it’s the implementation that I’m not sure of. Is it advisable to use a terminal strip for connecting the neutral or is it ok to splice? How would the relay trans play into that? Again looking for the best practice.

Thanks!

[martin manning]

The incandescent lamp (47 bulb?) draws 150 mA. I’d use a twisted pair of 22AWG for that.

[Raoul Duke]

Yes Sir, it’s a 47.

Quick question on the suppression cap on the manual switch: what’s the required voltage rating for that .01uf? If I don’t need the Mallory 150 630v for it - I’ll save that for something else.

[martin manning]

50V or 100V is probably ok, but I've never tried to find out how large any voltage spike might be.

[Raoul Duke]

Following the period correct layout I see the ground coming off the preamp out jack seems to disappear under the board. I’m wondering if that indicates that the shield on the coax should be grounded there? It would seem correct because the coax goes to the relay and there’s not much to ground to there.

Am I on track?

Thanks!

[ijedouglas]

Following the period correct layout I see the ground coming off the preamp out jack seems to disappear under the board. I’m wondering if that indicates that the shield on the coax should be grounded there? It would seem correct because the coax goes to the relay and there’s not much to ground to there.

Am I on track?

Thanks!

Yes, that is the COAX shield

[Raoul Duke]

Thanks Ian!
I might be catching on… a little - and slowly, lol.

I’m using a lot of your 3rd gen build as reference material. The photos are really helpful. Any tricks to the 2 into 1 splice with the neutral wires? My gut tells me to follow the guidance I got for the OT plate lead; but thought I’d ask since you popped in.

Thanks for the build thread and advice
Very much appreciated!