The Amp Garage

Well, I'd like to thank everyone here for the help. It's all good,Sounds good,great actually. I don't have anything besides clips to compare it to. I will play around with preamp tubes alittle more but a RFT in V1,Brimar in V2 and a JJ in V3 sound pretty damn good. I have a pair of Winged C's in it ...

Richie wrote:

My screen voltage at pin 4 of V5 is -32.56

is this a writing error? pin 4 of V5 should have a high B+ voltage.
Pin 5 of V4 or V5 would have the neg bias voltage.

Sorry typo on my part.

Try measuring pin 2 v5 to chassis ground and see if it's the same. But you get sound, right, and it sounds OK? Or not? Hey Doc, Both pin 2 and pin 5 of V5 read 3. something Volts ac. I don't know what it could be.In the morning I'll double check the grounds off the PT and see if thats it. The amp s...

Remember the heater voltage is AC and not DC. Make sure the meter is set correctly... and dont feel silly if thats the case, it's bit me before too. Fingers crossed... EDIT - see you posted... dont know what to suggest then, but it seems like it's about half what it should be... Hey Doc, Yes,it is ...

Using my GT bias plug I was able to Bias tubes at 40.
However heater voltage still 3.74 Vac.

Steve- If you're still on the limiter, this is normal- I had the same deal going and was stumped... all voltages read low with it. Take the plunge- take the limiter out of the setup and I bet that you are in the right ballpark. I think that I put this in my build guide as well, can't remember.... R...

Steve- If you're still on the limiter, this is normal- I had the same deal going and was stumped... all voltages read low with it. Take the plunge- take the limiter out of the setup and I bet that you are in the right ballpark. I think that I put this in my build guide as well, can't remember.... R...

What voltage do you read directly off the rectifier diodes junction? You should be seeing above 400, maybe 425 there with the other probe grounded to the chassis. What is your wall AC voltage? What did you do with the extra taps for the 260V mains and the 5v tube recto taps? hello, W/Tubes in and o...

What PT are you using? Did you accidentally hook up the center tap of the heater winding as one of your leads? That would give you half voltage on the heaters. Without tubes, the 366VDC might be right. Of more concern is the .072VDC on B+3 - B+5. Sounds like you're missing a connection somewhere in...

Heaters - is that one feed to ground, or between both heater feeds? Where is the 366VDC measured? Are you measuring the B+3, +4, +5 with or without the tubes and with it in on or standby? Hey gearhead, I'm getting 366 vdc at pin 6 of v4 and v5 also at standby switch I'm taking heater readings at pi...

Well....I finished up my express this morning.Used the lightbulb limiter. Throw the switch and bulb flashes and dims to a light glow.aok. Bias range w/limiter -21.00 to -32.00.I guess thats alright. I only get about 3.0 VAC or so on heaters. Without tubes I'm getting about 366 VDC On b+3,b+4 and b+5...

I'm still waiting on a few parts but I took the time to build my cab while I had the time.Steve [img:800:600]http://i138.photobucket.com/albums/q279/stevek66/DSC00283.jpg[/img] You guys with actual wood working skills make me tired. Great job sir! BTW, what size roundover did you use? Did you make ...

Chassis so far.....Steve

I'm still waiting on a few parts but I took the time to build my cab while I had the time.Steve

[/img]http://i138.photobucket.com/albums/q279 ... C00283.jpg

Well,I've made a little progress.I'm in parts limbo.Still waiting on wire,boards and a couple other items that Mouser was out of.Here's a couple pics so far [/img]http://i138.photobucket.com/albums/q279/stevek66/DSC00262.jpg[img:800:600]http://i138.photobucket.com/albums/q279/stevek66/DSC00263.jpg[/...