mlucitt
Veteran and General Yakker
The rotary switches are more Phase Linearly than a toggle switch. I'm in Florida, so maybe close...
Meet "Val" PL 400 series 1, SN 171xx
- Thread starter Oldskoolfan
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Oldskoolfan
Journeyman
Found it! West Florida Components, but you better hurry if you want one. They only have 2509 in stock . Rotary Switch 2 Pole 3 Position | West Florida Components
mlucitt
Veteran and General Yakker
Thanks, I'd like to buy them all and make them available to the upgraders. But I think I will just buy ten for now...
Oldskoolfan
Journeyman
Finished the control board this afternoon. Next step is to route the wiring for the volume controls and meters. Then complete the chassis harness, perform board installs and connections.
Gotta build a DBT yet. Considering a cheap variac since I have another 400 to rebuild. Hope I don't let the magic smoke out when I fire it up.
Gotta build a DBT yet. Considering a cheap variac since I have another 400 to rebuild. Hope I don't let the magic smoke out when I fire it up.
gene french
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looks very nice...
AngrySailor
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I got a cheap variac off crapazon, it’s definitely made of pure chinesium, the meter which I wouldn’t trust anyways crapped out first use, but it does do the job I guess... can’t complain for the $80 or whatever it cost really.
Oldskoolfan
Journeyman
Those are the ones I've been looking at. Don't really care about the meter, I got 2 flukes.
I suggest the simplest DBT is best. If you want meters use your Fluke. Switches on a DBT are unnecessary and they can complicate that critical time. Once it passes "bringing it up", your done with the DBT anyway.
Short 3 wire extension cord, carefully remove outer insulation at midpoint. Cut the black Line wire and connect it to your lamp base. Done. Weighs nothing and stows on the shelf easily.
Short 3 wire extension cord, carefully remove outer insulation at midpoint. Cut the black Line wire and connect it to your lamp base. Done. Weighs nothing and stows on the shelf easily.
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Oldskoolfan
Journeyman
Almost ready for power up and testing. Waiting on a heatsink for the triac. Not because it needs it, but for insurance to keep the legs up off the chassis. 
Oldskoolfan
Journeyman
Sunday's work. BTW, any reason the DBT has to have a 100 watt bulb?
gene french
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bigger the bulb...more amps are passed...100w bulb is a bit less than 1 amp...
You will be better off using shielded twisted pair for the pot connections...
Oldskoolfan
Journeyman
Then a 75 watt bulb should be good because if there is a short in the amp, current would be limited to less than an amp. Correct?
Oldskoolfan
Journeyman
Would you float the shield or ground to the chassis? I went this route because the coax center conductor just wasn't substantial enough to take any stress if moved much.
Shielded twisted pair, 22AWG conductors. Look up UL 2547 style cable. It is available in 22AWG shielded. Available from many sources, very common.
gene french
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Oldskoolfan
Journeyman
75 watt bulb works like a champ. Built my DBT this afternoon. Tried it on a known good amp. Acts like a soft start circuit.
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In fact. A DBT will literally piss off a soft start circuit..
mlucitt
Veteran and General Yakker
Is the Chinese cable any good? ebay had 62 results, all from China...
I would prefer USA cable. Maybe Belden 8761?
WOPL Sniffer
Veteran and General Yakker
Navo carries all the good stuff. Why deal with China OR Ebay???