Beiträge von strat100

Have got very little voltages on both V5 and V6 pin 4 (20MV TO 400MV),Have no bias voltages on pin 8 both tubes and have a very strong signal at pin 5 both tubes but no output,my voltages have gone up as though i have no tubes in.

The shame of it connected r55 and r56 to blue plate voltage connection instead of together,which i thought should solve it if i connected them together as they should be, but now havnt got any bias voltage on pin 8.have got -23.08 on pin 5 0f V5 and V6 but no voltage on pin 8 of both tubes.How do i sort this one gents please.

Regards

Checked everything a few times and havnt got anywere still very low volume,wonder if it is the output transformer?
How would i go about checking it to make sure?

Regards

Changed tubes around and get a very slight increase in volume,but not a lot at really.speaker outs checked again but plugged speaker into the 16 ohms instead of 8 ohms just to see if that was any better and main fuse blew straight away?new fuse in and tried it back into 8ohms,very low volume but didnt blow fuse,so turn off amp and back into 16 ohms and main fuse blew straight away.

checked wiring and from output transformer to speaker outs and it is as layout .

Regards

The resistance of the secondaries are both 0.1 ohms.I get a stong signal going into V4 PIN 7 and a weak one out of pin 2 and i hope i am correct in thinking i should be getting a strong signal out of pin 2?

Regards

Thanks for replies.will check speaker outputs and R47 later tonight and the resistance checks.

Regards

Thank you gentlemen for giving a helping hand,the send and return are both working fine, have a good strength signal through the audio probe at v5 and v6 at pin 5 and pin 4 but then drops volume before speaker outputs.hope i am doing things right and need some guidance on were to look next.

Regards

Thank you Acron for your reply..fairly new to amp building but will go through the circuit tonight with an audio probe and try to find out were the signal is going.would have thought though that if the signal was going to ground i wouldnt get any output signal at all?the volume is very low but audible maybe just above whisper quiet but audible enough to know that both channels and all controls work perfectly.

Regards

Just checked the output transformer and i get the following results -
Powertubes in no speaker connected
pin 6/7 = 310.6v
pin 12 = 310.4v
pin 13 = 310.2v

Resistance
only the 2 powertubes in and no speaker connected
Resistance between 6/7 and 12 is 88K Ohm

Resistance between 6/7 and 13 is 83.8k oHM

Put a new switch in for the smooth and that is now sorted.

Regards

Hi to all,
Just finished building the kit checked all voltages and everything was within spec everywere,except for the heaters at 7.2v and a line votage of 241v.set bias to 34.8mv on V6 and V5 was 29.8MV.
Plugged guitar in and get a very low volume on both channels with everything maxed out,tried it in all speaker outs (4,8 and 16).plugged guitar into effects loop return and get no signal?.
Going through checking everything right now but would like a little help please.[Blockierte Grafik: http://forum.musikding.de/vb/images/icons/icon7.png]

Just checked the smooth switch and get 307v on all contacts so looks like that is broken.

Thanks