Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: SleepLess on August 28, 2014, 08:17:20 am

Title: Marshall 2061 wiring
Post by: SleepLess on August 28, 2014, 08:17:20 am: Hi.
I'm coming for a little help. I am building a Marshall lead and bass replica but the chassis is a bit different from the original one and I don't know how to implement the switches wiring. The original had a single DPDT switch, mine has a SPST ON/OFF switch and a SPST Standby switch so I don't know how to wire each switch. Here's the layout I'm using and also the Mercury PT schematic. I'm wiring it for 230V operation. Thanks guys!

(http://img11.hostingpics.net/pics/348003Layout.jpg)

(http://img11.hostingpics.net/pics/359830Scan0001.jpg)
Title: Re: Marshall 2061 wiring
Post by: shooter on August 28, 2014, 08:33:10 am: look at the 2 spst as one dpdt as long as you're dpdt switch only had 2 wires per side, if it had 3(top, bottom, center) then a spst probably won't get it. A schematic might help to get a better idea of "what's being switched"
Title: Re: Marshall 2061 wiring
Post by: sluckey on August 28, 2014, 10:06:08 am: I would wire it just like this Ceriatone layout...

(http://ceriatone.com/images/layoutPic/marshallLayout/20WCeriatoneLayout.jpg)
Title: Re: Marshall 2061 wiring
Post by: SleepLess on August 30, 2014, 06:22:41 am: Hi!
Thank you for your replies guys. So the amp is finished and sounds good but I have a problem nonetheless: the standby is not working! I mean whether it is on stdby or not, the amp can be played. Here's a picture of what I've done, I think I really floowed the ceriatone layout for the stdby wiring but well...

(http://img4.hostingpics.net/pics/936969DSC36354512x3012.jpg)

So the stdby blue wire is going to the 470 ohms 10w resistor along with the OT CT and point A of the filter cap (three wires are soldered to this turret).
The stdby red wire is going to point A of the filter cap. Mmm... Must be something wrong here... :think1:
On my layout (not the Ceriatone) the 470 ohms and 22 ohms resistors are linked. On the Ceriatone, they're not.
Title: Re: Marshall 2061 wiring
Post by: sluckey on August 30, 2014, 08:00:12 am: It's wired wrong. Study the Ceriatone layout and make that part of your board look just like the Ceriatone layout. As you have it wired now, the standby switch is shorted out by that link on your board.
Title: Re: Marshall 2061 wiring
Post by: SleepLess on August 30, 2014, 08:02:00 am: Quote from: sluckey on August 30, 2014, 08:00:12 am
It's wired wrong. Study the Ceriatone layout and make that part of your board look just like the Ceriatone layout. As you have it wired now, the standby switch is shorted out by that link on your board.

Yes, that's what I was thinking. I need to move the red wire to the 22 ohms resistor and not the 470 ohms and then cut the link that's under the board. It's gonna be tricky.
Thanks Sluckey!
Title: Re: Marshall 2061 wiring
Post by: sluckey on August 30, 2014, 08:04:37 am: Quote
then cut the link that's under the board. It's gonna be tricky.
That's a good argument for jumpers on top of the board. :wink:
Title: Re: Marshall 2061 wiring
Post by: Willabe on August 30, 2014, 10:09:24 am: These 2 power R's should have some space in between them for free air flow to keep cool.

Brad :icon_biggrin:
Title: Re: Marshall 2061 wiring
Post by: SleepLess on August 30, 2014, 10:12:20 am: Quote from: Willabe on August 30, 2014, 10:09:24 am
These 2 power R's should have some space in between them for free air flow to keep cool.

Brad :icon_biggrin:

Thanks Brad, will try and move them a bit.
Title: Re: Marshall 2061 wiring
Post by: SleepLess on August 30, 2014, 11:10:30 am: "Problem" solved, thank you guys! :worthy1: