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Author Topic: ots troubles  (Read 28585 times)
bluesfendermanblues
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« Reply #30 on: November 17, 2009, 09:02:49 AM »
Quote from: RiffRaff on November 17, 2009, 08:54:14 AM
Found it, I pinched a wire between the standoff and mainboard
I built listening probe
(a pair of aligator clips, a 1/4" jack, a .047uF/400V (or more) cap and some wire. You connect a wire from an aligator clip to the ground connection on the jack, the cap to the other clip and the other side of the cap to the hot lead on the jack.)
then hooked that jack via 1/4" cable to another amp
Plugged in a tone generator to the OTS input and tried to trace the sound
but I could not get a signal from the tip of the input jack on the OTS
The listening probe worked fine when the tone generator was hooked directly to the aligator clips but not thru the input jack of the OTS
sssoooo unless I've wired the input jacks wrong which I've checked several times and even rewired again there must be a short to ground on the inputs
Is this correct?
I'm just guessing......remember I'm a newbie

Tim


Yes, with not jack plug connected to the input, the input jack (22k into V1a, pin2) is shorted to ground.
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bluesfendermanblues
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« Reply #31 on: November 17, 2009, 10:58:32 PM »
Whats the current status ?? is the amp operational ?
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RiffRaff
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« Reply #32 on: November 19, 2009, 04:08:24 AM »
Sorry just got back from a ZZTop concert
No the amp has no sound as of yet
Nik say's that the input is wired correctly
so I'm stumped
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hywelg
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« Reply #33 on: November 19, 2009, 09:03:51 AM »
Time to take it to a tech?
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mcinku
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« Reply #34 on: November 19, 2009, 09:15:12 AM »
Quote from: hywelg on November 19, 2009, 09:03:51 AM
Time to take it to a tech?

+1
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bluesfendermanblues
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« Reply #35 on: November 19, 2009, 10:10:22 AM »
+1 from me as well

However, I have one small suggestion you could try.

For testing purpose, as per the attached picture, solder a wire direct from V1 out to the power amp in. This way you will find out if the problems are related to the relays or send/return jacks. Just an idea.

* 1_wire_Clean_direct_to_output.jpg (275.08 KB, 1277x958 - viewed 629 times.)
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RiffRaff
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« Reply #36 on: November 19, 2009, 03:40:06 PM »
closest amp tech is probably 300 miles from where I live
I've been talking to Nik and he asked if the tip of the input jack was shorted to ground
With a 1/4 inch cable inserted I have continuity to the chassis
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bluesfendermanblues
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« Reply #37 on: November 19, 2009, 05:18:23 PM »
Quote from: RiffRaff on November 19, 2009, 03:40:06 PM
closest amp tech is probably 300 miles from where I live
I've been talking to Nik and he asked if the tip of the input jack was shorted to ground
With a 1/4 inch cable inserted I have continuity to the chassis

Solder an alternative jack direct to pin 2 on V1 (and disconnect the existing input wire)

If this doesn't work, use the 'yellow wire' mod I've pictured above.
« Last Edit: November 19, 2009, 05:25:36 PM by bluesfendermanblues » Logged
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RiffRaff
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« Reply #38 on: November 19, 2009, 06:34:22 PM »
Well I feel kinda dumb
I have all the wires that are spliced into the shielded wire hooked up to the main conductor wire instead of the shielding
I'll redo them after work and let you know how it goes
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RiffRaff
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« Reply #39 on: November 20, 2009, 12:55:56 AM »
Ok
Fixed all the wires and we had sound
Played it for about ten minutes and it just quit suddenly
all the voltages are good and the bias
Any ideas?
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bluesfendermanblues
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« Reply #40 on: November 20, 2009, 07:02:46 AM »
Quote from: RiffRaff on November 20, 2009, 12:55:56 AM
Fixed all the wires and we had sound

What wires??
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RiffRaff
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« Reply #41 on: November 20, 2009, 07:36:05 AM »
From the post above

"Well I feel kinda dumb
I have all the wires that are spliced into the shielded wire hooked up to the main conductor wire instead of the shielding
I'll redo them after work and let you know how it goes"

It was working good , all the switches and pots did what they were supposed to
It did have an ac hum that wasn't that bad, not sure if it is from this old building I live in or wire placement
Fuses are good, all the voltages are good
it just quit working
I used to get a small click or pop when I turned the standby switch on but now I get nothing
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bluesfendermanblues
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« Reply #42 on: November 20, 2009, 09:01:33 AM »
Quote from: RiffRaff on November 20, 2009, 07:36:05 AM
From the post above

"Well I feel kinda dumb
I have all the wires that are spliced into the shielded wire hooked up to the main conductor wire instead of the shielding
I'll redo them after work and let you know how it goes"

It was working good , all the switches and pots did what they were supposed to
It did have an ac hum that wasn't that bad, not sure if it is from this old building I live in or wire placement
Fuses are good, all the voltages are good
it just quit working
I used to get a small click or pop when I turned the standby switch on but now I get nothing

blown fuse?
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RiffRaff
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« Reply #43 on: November 20, 2009, 08:00:44 PM »
Fuses are good
Here's something I noticed
When I turn up the ratio and level I can here an ac hum coming from inside the chassis
sounds like it's coming from the pots themselves but I'm not sure
and when I touch one of the output tubes it get louder
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hywelg
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« Reply #44 on: November 20, 2009, 08:42:25 PM »
Check your socket wiring, what about all the checks you made initially have you redone them? ie line level in at FX loop, FX loop out to another amp, bias still OK etc. trouble shooting is just a matter of being thoroughly methodical and breaking the testing down into bits to eliminate various possibilities.

I'd hesitate to suggest it but consider chopsticking various signal path connections, based on your results from the fx loop tests above. If you don't know what I mean then you probably shouldn't do it, it is dangerous.
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