VTA driver board - resistors heat

Just complete my VTA 70 form bob, sound very good clear than my friend's st70
but the resistors on the PCB is very hot. R11 ~R13 also R19 ~R22
is it normal ?


gz34
pin 2 448 VDC
pin 8 448 VDC


EL34

pin 1,8 0.4 VDC
pin 2, 7 3.5 vdc ????
pin 3 436 VDC
pin 4 436 VDC
Pin 5,6 43 VDC
pin 8 0.4 VDC

quad cap

section #1 half circle 439 VDC
section #2 no symbol 440 VDC
section #3 triangle 385 VDC
section #4 half square 449 VDC


I can not get 6.3VDC on el34 pin 2,7 what should i check ?anyway still play music good.

I think the 6.3 volts should be AC.

Thanks bob and corndog71. i'll check pin2 and pin7 again thanks you guys.

EL34

ACROSS pins 2 and 7 6.71 vac

gz34
pin 2 453 VDC
pin 8 453 VDC
pin 4 369 VAC
Pin 6 369 VAC

btw over all 5 volts high than earl morning
that's a little high at night. maybe I'll get VOLTAGE REGULATOR.
how about this one I have Transcendent Grounded Grid Preamp, JoLida CDP, VTA ST70
is it good enought ?

http://www.ebay.com/itm/221195867176?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

Same test voltages on the ST120 board?

Be nice to have a set of references for the different boxes if and/or when they're needed for troubleshooting. Maybe even a sticky?

PS ... I got the exact same model variac for bench work a few years back and it's been trouble free. I did a long term test a bit back when it was pointed out that it would make a good step down transformer for a tube amp and found out it does take a while to stabilize. Turn it on with the Kill-A-Watt plugged into the power out, set it to maybe 117vac, and a hour later it had drifted up a couple. Re-adjusted it, and it stayed pretty much on center for the next couple days anyway, with the slight drops you'd expect in a 100 year old farm house when something big like a furnace kicked in. Anyway, I figure just leave it on if you're using it as a voltage regulator driving the amp. Or set it a little higher so you end up with good power that's still in a good operating range.

Probably a good idea here as my voltage AVERAGES 122+ according to the Kill-A-Watt ... handy tool btw for those who don't already have one.

Real deal ... what amazes me is they still do free shipping. Those things weigh like a dead horse.

that's a GREAT price on that variac, and free shipping!
everybody that doesn't have one, should get one!

Maybe two!

Show us your variacs!!



(It's in there somewheres)