Treble pot on RF #102

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martin manning
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Re: Treble pot on RF #102

Post by martin manning »

Some amps used an on-off-on switch for R/J, to get PAB in the middle position with no wiring change required. I don't know about 102.
Charlie Wilson
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Re: Treble pot on RF #102

Post by Charlie Wilson »

Hello, If I may go back a couple posts and comment about 1/2w metal films. I seems to me, for high plates, Dumble favors Roderstein MK3 1/2 watt metal films. Sometimes he'll throw in a few NTEs. Also Roderstein Mk3 on high plate cathodes. I bet if you look under the goop in the real #102 that is what is used. Also those Q-line Draloric he uses on the preamp board are all 1/2 w. Actually slightly less if you look at the data sheet for LCA0411. The exception would be the NFB resistor. I think KOA speer 1/2 w metal film is a perfectly acceptable sub for the Roderstein.
CW
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martin manning
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Re: Treble pot on RF #102

Post by martin manning »

Thanks, CW. This thread really is all over the place!
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M Fowler
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Re: Treble pot on RF #102

Post by M Fowler »

All good stuff though guys.

Anything regarding RF #102 or Dumble components is good with me. :D

Mark
Mark
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Re: Treble pot on RF #102

Post by Mark »

I'm surprised these pots aren't available new, the same goes for the 350K tapped pot, the taper is nothing like the originals. I have mentioned this to Weber etc who sell them but there isn't much interest.
Yours Sincerely

Mark Abbott
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M Fowler
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Re: Treble pot on RF #102

Post by M Fowler »

I might go with the small chickenhead knobs, not sure yet.

Received my green mini switch tips yesterday.

The green light looks good.

Mark
RF 102 chassis front.jpg
RF 102 chassis green switch tips.jpg
RF 102 chassis green light.jpg
RF 102 chassis top.jpg
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norburybrook
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Re: Treble pot on RF #102

Post by norburybrook »

that's all looking especially lovely :D love the green switch tips. I tried to find some of those when I built my 102 but drew a blank. where are they from?

are you going to do the FET?

I still haven't done one yet in 5 builds!!

M
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martin manning
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Re: Treble pot on RF #102

Post by martin manning »

The FET board is there... still needs a trimmer, though. Looks like it worked out ok. That was a tight squeeze in transitioning from PCB to eyelets.
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norburybrook
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Re: Treble pot on RF #102

Post by norburybrook »

ah yes, I can see it.

I've ordered one of these chassis and boards from Taylor to build my last 'Dumble' so I might as well do it 'properly' and do the FET this time when I do it :D


Marcus
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M Fowler
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Re: Treble pot on RF #102

Post by M Fowler »

Mini switch colored tips available from http://led-switch.com/

http://led-switch.com/Miniature%20Toggle%20Switch.htm scroll down near bottom of page to see the various color caps available.

Mark
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norburybrook
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Re: Treble pot on RF #102

Post by norburybrook »

I've a feeling the postage would be more than the items as I found out when ordering some knobs from Allied electronics in the USA.....$55 postage for $20 knobs that was added as I paid so I couldn't retract.



Marcus
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M Fowler
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Re: Treble pot on RF #102

Post by M Fowler »

norburybrook wrote: Sun Aug 13, 2017 10:42 pm I've a feeling the postage would be more than the items as I found out when ordering some knobs from Allied electronics in the USA.....$55 postage for $20 knobs that was added as I paid so I couldn't retract.



Marcus
Yes that was my case as well when I ordered these. But since you live in London I will give you a UK source that kept popping up and it took me hours to find a USA distributor.

http://www.railroomelectronics.co.uk/Sw ... Page1.aspx
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norburybrook
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Re: Treble pot on RF #102

Post by norburybrook »

thanks Mark...........model railways! who'd have thought. Funny I was talking to an old bass player friend I hadn't seen in a while the other day and he's building a very elaborate model railway in his garden.


M
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martin manning
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Re: Treble pot on RF #102

Post by martin manning »

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norburybrook
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Re: Treble pot on RF #102

Post by norburybrook »

wow..thanks guy's sometimes knowing the correct term for a component search is all that's needed otherwise you search endlessly.

I realise however I have the wrong kind of 'Bat's on my switches so there wont work :(

In future though I will use the regular bats so I can have coloured switches.

M
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