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Author Topic: finished...are these voltages ok?  (Read 6922 times)
RiffRaff
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« on: November 10, 2009, 06:11:22 AM »
Finished building my OTS
started it up with a current limiter and it looked good so I fired it up
no sound ...so I'm hoping some of you fine gents can help me out

V1 pin1=193   pin3=1.8   pin6=202   pin8.001
V2 pin1=200   pin3=1.9   pin6=207   pin8=.001
V3 pin1=301   pin3=59   pin6=301    pin8=.001
V4 pin3=463   pin4=461   pin5=54   pin6=463   pin8=.039
V5 pin3=463   pin4=462   pin5=54.5   pin6=463   pin8=.027

The bias on v5 is 27 and v4 is 39
Is this normal to be that far apart?
I'm guessing the low numbers on pin8 of v1,2 and 3 is the reason for no sound
I'm still learning the ropes so please take it easy on me
Thanks for any help
Tim
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bluesfendermanblues
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« Reply #1 on: November 10, 2009, 07:14:48 AM »
Quote from: RiffRaff on November 10, 2009, 06:11:22 AM
Finished building my OTS
started it up with a current limiter and it looked good so I fired it up
no sound ...so I'm hoping some of you fine gents can help me out

V1 pin1=193   pin3=1.8   pin6=202   pin8.001
V2 pin1=200   pin3=1.9   pin6=207   pin8=.001
V3 pin1=301   pin3=59   pin6=301    pin8=.001
V4 pin3=463   pin4=461   pin5=54   pin6=463   pin8=.039
V5 pin3=463   pin4=462   pin5=54.5   pin6=463   pin8=.027

The bias on v5 is 27 and v4 is 39
Is this normal to be that far apart?
I'm guessing the low numbers on pin8 of v1,2 and 3 is the reason for no sound
I'm still learning the ropes so please take it easy on me
Thanks for any help
Tim

Anode voltages are fine:
Those are the voltages measured on pin 1 and 6 on the tues V1,V2 and V3
hereto pin 3 and 4 on tubes V4 and V5.

Your cathode voltages are falulty
Those voltages on pin 8 on V1,V2 and V3 looks like your haven't connected these at all - Check again. Do the preamp tubes glow? do they have proper heating voltage between pi 4/5 and 9??

Bias
Is very far apart - maybe your V4 and V5 tubes are not properly matched, but if they don't hum or otherwise sound funny, you can keep using untill you get around to buying new ones.
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RiffRaff
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« Reply #2 on: November 10, 2009, 07:52:02 AM »
Thanks I'll check again in the morning
The preamp tubes were glowing when I took the measurements
a 12ax7 is ok for the pi tube or is it a different tube that I need?
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bluesfendermanblues
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« Reply #3 on: November 10, 2009, 08:38:45 AM »
Quote from: RiffRaff on November 10, 2009, 07:52:02 AM
Thanks I'll check again in the morning
The preamp tubes were glowing when I took the measurements
a 12ax7 is ok for the pi tube or is it a different tube that I need?

12ax7 is correct
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RiffRaff
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« Reply #4 on: November 11, 2009, 02:59:48 AM »
opps I was measuring pin 9 instead of 8 on v1 v2 v3
v1 and v2 are 1.7 and v3 is 60
what is the next step to in find out why there is no sound?
I plugged a cable in the power amp and it works
thanks for helping me out
Tim
« Last Edit: November 11, 2009, 06:10:51 AM by RiffRaff » Logged
mcinku
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« Reply #5 on: November 11, 2009, 07:20:33 AM »
Did you try to change V1,V2,V3 tubes with something you know it works?
If you crank the Volume knob, ... is the noise level the same or it changes with more volume?
When you measured the plate voltages, did you hear any click sound coming out your speaker?... Especially when measuring the V3 tube.
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RiffRaff
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« Reply #6 on: November 11, 2009, 07:37:34 AM »
Quote from: mcinku on November 11, 2009, 07:20:33 AM
Did you try to change V1,V2,V3 tubes with something you know it works?
If you crank the Volume knob, ... is the noise level the same or it changes with more volume?
When you measured the plate voltages, did you hear any click sound coming out your speaker?... Especially when measuring the V3 tube.


I've tried 6 different tubes (all new)
there is no noise at all... dead quite
yes I heard noise when taking voltages
I've checked and double checked input wiring and it seems to be ok
I don't know what to do next
Thanks for helping

Tim
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bluesfendermanblues
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« Reply #7 on: November 11, 2009, 07:42:57 AM »
Quote from: RiffRaff on November 11, 2009, 07:37:34 AM
Quote from: mcinku on November 11, 2009, 07:20:33 AM
Did you try to change V1,V2,V3 tubes with something you know it works?
If you crank the Volume knob, ... is the noise level the same or it changes with more volume?
When you measured the plate voltages, did you hear any click sound coming out your speaker?... Especially when measuring the V3 tube.


I've tried 6 different tubes (all new)
there is no noise at all... dead quite
yes I heard noise when taking voltages
I've checked and double checked input wiring and it seems to be ok
I don't know what to do next
Thanks for helping

Tim
Check te wiring on the cathodes (pin Cool on V 1,2, 3.
Maybee you have colder joints?? Search for the error in this area
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mcinku
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« Reply #8 on: November 11, 2009, 09:13:52 AM »
Quote from: RiffRaff on November 11, 2009, 07:37:34 AM
I've tried 6 different tubes (all new)
there is no noise at all... dead quite
yes I heard noise when taking voltages
I've checked and double checked input wiring and it seems to be ok
I don't know what to do next
Thanks for helping

Tim

What about if you engage the OD and crank those pots, any noise?
If you would detect some noise, at least you would know something is wrong with V1 and this will narrow down your search.

My guess would be that V1 has some issues.  Huh?
« Last Edit: November 11, 2009, 09:15:32 AM by mcinku » Logged
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RiffRaff
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« Reply #9 on: November 11, 2009, 03:52:29 PM »
Quote from: mcinku on November 11, 2009, 09:13:52 AM
Quote from: RiffRaff on November 11, 2009, 07:37:34 AM
I've tried 6 different tubes (all new)
there is no noise at all... dead quite
yes I heard noise when taking voltages
I've checked and double checked input wiring and it seems to be ok
I don't know what to do next
Thanks for helping

Tim

What about if you engage the OD and crank those pots, any noise?
If you would detect some noise, at least you would know something is wrong with V1 and this will narrow down your search.

My guess would be that V1 has some issues.  Huh?
Tried that and still nothing
reflowed all the pins on v1 and nothing
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bluesfendermanblues
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« Reply #10 on: November 11, 2009, 04:02:48 PM »
Check the wiring to pin 8 and V1, V2, and V3

Are the 5uF + 2,2k properly grounded??

Check with you ohm meter from " - " on the 5uF cap to ground
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RiffRaff
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« Reply #11 on: November 11, 2009, 08:36:44 PM »
Not sure what side is negative as there are no + or - signs on it
maybe I have it in backwards?
here is the best pic I could get with my camera
I'll try to get a better pic

* riffots2.jpg (1770.92 KB, 3648x2736 - viewed 505 times.)
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