Dagnall T-2562 schematic

[Mxzx]

Yeah I know you did!! I just figured by the time I dressed the leads, I might as well just solder it in place. It didn't take all that long!

So for voltage checks, I have 6.1vac across the heater leads at the tube socket. I have 370vac across the two leads where they go to the turret board. This was done on standby with no speaker load.

Does the 100v thinwall get measured at the filter cap?

Thanks

[neikeel]

The 100v is the ac bias feed so gets measured on the board where it hooks to the 27k bias feed resistor and ground

[Mxzx]

Thanks, I'll track it down and measure.

Do the other values seem okay?

[Mxzx]

I only appear to have about 4.4vac across those terminals in standby mode?

[neikeel]

Maybe why your outputs were redplating - no bias!

There is a way around this by taking the ac bias from one half of the ac feed from the HT but the bias feed resistor will need to be much bigger.

If 100vac needs a 27k and you probably have 180vac on half the HT. my 50w on bench now has 335vac using 220k dropper so 120-150k maybe good place to start.

[Mxzx]

Okay, I'll see what I have around here.

Do you think that circuit in the tranny is shot or could I possibly have mis wired?

[neikeel]

Okay, I'll see what I have around here.

Do you think that circuit in the tranny is shot or could I possibly have mis wired?

If you measure between the two thin walled leads (usually green and white) then possibly.

[Mxzx]

Okay, I'll see what I have around here.

Do you think that circuit in the tranny is shot or could I possibly have mis wired?

If you measure between the two thin walled leads (usually green and white) then possibly.

Yeah, the one goes to the resistor, and the other to ground. Does it matter which side is sent to ground? Maybe I have it backwards?

[Mxzx]

I pulled both thin wall wires and measured. I am getting 60 vac on each one?

[neikeel]

I pulled both thin wall wires and measured. I am getting 60 vac on each one?

You mean across the pair? it is one continuous coil (see schematic), no centre tap and it is AC so you should see 60vac -same with your leads reversed

[Mxzx]

No, I was getting 60vac on each leg when checking to ground?

When I unsoldered the ground, I have 60vac at bias resistor??

I'm thinking I did something wrong, but they were the only two thin walled wires on the transformer.

[Mxzx]

Just rechecked. I definatley have 50-60vac on each thinwall wire when checking to ground. When I go across the two I only have 4.4vac?

I have the covers off the transformer, and it seems to be getting pretty warm on the sides of coils. Is this normal?

I'm thinking it might just be time to get a new transformer? Since ****** seems to be gone, what do you guys recommend?

[neikeel]

http://www.marstran.com/T2562.htm

[Mxzx]

Thanks. I just shot them an email.

I was just wondering if the amp will bias with 60vac?

Is it possible that this transformer would have 2 60vac taps for some reason? Could this be for a 50w JMP?

[neikeel]

Thanks. I just shot them an email.

I was just wondering if the amp will bias with 60vac?

Not reliably as it is under par already

Is it possible that this transformer would have 2 60vac taps for some reason? Could this be for a 50w JMP?

Not 50w with bias feed like this.

Have you checke that you are using the correct primary taps as if you are using the 220v tap and feeding with 120v you could get this low reading, check what HT you are getting.