The values only make sense with tubes plugged in. You wouldn't read anything at the cathodes without tubes ...

According to the very low heater voltage: did you measure to ground or between pins 4/5 and 9 at the tubes? The latter is the right methode.

Cheers
John

Greetings John

Your right the cathods wouldn't have any current without the tubes...
And for the heathers I measured between the pins 4/5/9 and ground, that's the wrong way...
I'm such a noob,thanks for making this clear to me.

As for the others values what's your opinion?

Thanks.

Hi,

what's your heater voltage AC between 4/5 and 9? If it is still far from 6.3V:
maybe check to proper cleaning of the heater supply wires before soldering them. They have a brownish insulation lacquer on the surface, that has to be scraped off.


VG
Andreas

As for the others values what's your opinion?

Sorry, but I don't have any opinion on that; I didn't exactly have a close look. The voltages are far to low, especially at V2b. Are you sure about those 86V? 186V would be more conclusive (but still far to low). I'd check the whole construction and have a close look at all resistor values and don't forget the PSU.

@Andreas: the amp is running in a kind of way; it won't do that without working heaters.

Cheers
John

the amp is running in a kind of way; it won't do that without working heaters.

Just wanted to double-check.

VG
Andreas

Hallo,

86 V at the V2b is OK. Please see the updated schematics with the reference voltages.

Best regards, Dirk

Kurz OT, aber @Dirk:
Ist es Absicht, dass das Layout vom Jim nicht mehr verfügbar ist?
Grüße,
Jannis

Natürlich nicht, das liegt an den sch... Einstellungen
Ist wieder da.

Gruß, Dirk

Nur so:-) Dankschön!

Hi.
In fact the value I read between the two green wires from the heater is 6.3 v~.
I'm sorry for my mistake.

According to the new diagram provided, my values aren't too far from the real thing.

Diagram:                                      My values:
V1a. Pin1.  134 v.                          V1a. Pin1.   124 v.

V1a. Pin3.  1v.                              V1a. Pin3.   0,98 v.

V1b. Pin6.  202v.                          V1b. Pin6.    197 v.

V1b. Pin 8.  60v.                           V1b. Pin8.    52 v.

V2a. Pin1.  173v.                          V2a. Pin1.   158v.

V2a. Pin3.  1,85v.                          V2a. Pin3.   1,72v.

V2b. Pin6.   86v.                           V2b. Pin6.    86v. 

V2b. Pin8.   0,77v.                         V2b. Pin8.    0,72v. 

V3 plate.    240v.                           V3 plate. 240v

V3 grid.      190v.                           V3grid.  183v. 

V3 anode.     5v.                            V3 anode 5,38v.


My Power supply

B1. 266v

B2. 248v

B3. 197v

B2 / B3. 50v.


The values are not exactly the same , but I think they may be in the acceptable range, I just need someone to confirm this to me so that I can use my amp without worries.

Another question, when I was making the measures, I noticed that 3 of the large capacitors from the psu had current from the metallic top to ground... Is this normal?

Just want to say a big thanks to those who lost some of they're time trying to help me.

Greetings.

Paulo.







   

In the last post, I meant cathode instead of anode in the v3 values...