Metropoulos Forum

What are the correct power and standby switches for a JTM 45/100. Considering profile, current rating, bat length, etc?

i'm wondering too. did you have any clues since you posted this message, for an accurate type of switch ?

The ones MArshall sell are correct, although the dress nuts would have been knurled rather than machined with the two slots.

The block end EL34 45/100 amps had the torotor (round black bat) AFAIK.

thanks !

I think Neal is talking about these?
$15.50


Looks like a lot of guys use these:
$3.50
Is there any reason these won't work?
Looks like it would take up less space in the chassis as well

No, they look the same, similar ratings in single pole single throw applications. I use those on JTM45 and 50watters but prefer the DPST ones on the 100watters with high voltages.

I just wire up both poles in parallel - less likely failure (sorry my paranoia ).

Neil,

Do have some pics of one of your builds with the DPST switches? I would like to see how close they come to the power board.

Thanks!

nice infos !
and by the way, where did you find these switchs please ?
thanks

These pics are from:
http://www.valvestorm.com/Products/Switches

On this one I used Arrows:
http://i76.photobucket.com/albums/j2/ne ... hed004.jpg

Here is an originalhttp://i76.photobucket.com/albums/j2/ne ... c09009.jpg

Have one on the bench, with the Marshall ones - need pics

cool !
so the first one is the way to go.

is it a vintage bulgin plug ... with three pins ? does it exist ? i saw some but with 2 pins.
and what diodes would be the best for a jtm45/100 , on this power board ? i bought 7 x BY114, the metalic ones, but not mullard, it seems "new" or in very good conditions. and ... cliff jacks , right ?

btw, i tried this vintageamps - plexi palace site for the selectors but the site doesn't work anymore. thanks anyway.
indeed, i should try to have them made ! i could produce a certain number of these perhaps ... if someone gives me every dimensions, and several pictures ? would somebody be interested ? that would be cool to have some reproductions.

oh, good news ! actualy i found many in england, like this, are they right ?

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... rid=229508" onclick="window.open(this.href);return false;

yep, but the early JTM's used to have bulgin mains with the screw instead of the solder terminals in the back. But both are correct, id say.

Btw. doesn't George use just SPST carling switches for his 45/100? Can anyone confirm this? Just wondering if this is safe, as it looks like i'm going to use these too. The problem with the other options Neil mentioned is that they might not fit behind the 45/100 11 hole wide power board. Any other options that might fit in there, besides the Carling SPST? I see there is a carling SPDT that takes as little space as the SPST, but can't find anything similar in DPST?

Looks like the Carling SPST in George's builds to me. The are 6A @ 125v, 3A @ 250v. Assuming the ratings proceed in linear fashion, one would get 1.5A @ 500v, and 1.2A @ 600v. HT fuse in a JTM 45/100 is 1A. The switches should be OK.

The DPST are available. They would have two lugs at each end of the switch, instead of the two lugs at one end that the SPST has.