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Author Topic: ots troubles  (Read 27896 times)
RiffRaff
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« on: November 12, 2009, 07:32:51 AM »

I guess I'll repost what I have done again since my last post is mia

I've have no sound
v1 pin1=193 pin3=1.8 pin6=202 pin8=1.7
v2 pin1=200 pin3=1.9 pin6=207 pin8=1.8
v3 pin1=301 pin3=60  pin6=301 pin8=60
v4 pin3=463 pin4=461 pin5=54 pin6=463 pin8=.039
v5 pin3=463 pin4=462 pin5=54 pin6=463 pin8=.027

I have sound when I plug into power amp in
I have sound when checking volts on v3
I've checked and double checked input wiring and solder joint
all wiring is correct on v1,2 and 3
all solder joints on v1,2 and 3 are nice and shiny
I.ve swapped v1,2 and 3 with 6 different 12ax7 tubes
I have no sound at all even with overdrive section cranked
I've tried to upload pics but everytime I do the thread becomes unreadable
So what would the next step be?
I was asked to check ground on 05 cap on the - side but the cap does not have + or - signs on it. That was one of the pics I was trying to upload
I get a reading from both sides of the cap but I don't see where it would be grounded
thanks for any help

Tim
« Last Edit: November 16, 2009, 06:36:56 AM by RiffRaff » Logged
bluesfendermanblues
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« Reply #1 on: November 12, 2009, 08:13:50 AM »

Hi Tim,

My suggestion was not the check ground on the 05 cap, but instead to check if the cathode resistors (2.2) and caps (5 uF) were grounded. however, judging by your new V1 and V2 pin8 voltages of 1.7 and 1.8 volts. It now looks like the cathodes are grounded, so forget about that.  Wink

Just to make sure the signal is ok......can you hear the noise level (in the speakers) go up, when you engage the OD? From your description above, I would guess you can.

My suspicion is the wiring of the input jack socket, which can be a little tricky, with various connectors and all. For testing purposes, you could try to solder another (simpler) jack socket with a piece of shielded cable direct to pin2 on V1 and ground. Obviously, if that works, your chassis mounted jacksocket is wired wrong.  Cool



« Last Edit: November 12, 2009, 08:35:35 AM by bluesfendermanblues » Logged

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tonym
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« Reply #2 on: November 12, 2009, 08:21:15 AM »

Yes those pesky input connectors are a bit fiddly - I would double check them.
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mcinku
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« Reply #3 on: November 12, 2009, 08:34:06 AM »

Hey perhaps one of relays is turned the other way around.  Grin


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hywelg
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« Reply #4 on: November 12, 2009, 09:55:19 AM »

Or try a line level source into FX return socket.
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mcinku
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« Reply #5 on: November 12, 2009, 11:31:53 AM »

Or try a line level source into FX return socket.

He said...
I have sound when I plug into power amp in
So I guess his power section is fine...
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RiffRaff
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« Reply #6 on: November 12, 2009, 03:27:16 PM »

Hi Tim,

My suggestion was not the check ground on the 05 cap, but instead to check if the cathode resistors (2.2) and caps (5 uF) were grounded. however, judging by your new V1 and V2 pin8 voltages of 1.7 and 1.8 volts. It now looks like the cathodes are grounded, so forget about that.  Wink

Just to make sure the signal is ok......can you hear the noise level (in the speakers) go up, when you engage the OD? From your description above, I would guess you can.

My suspicion is the wiring of the input jack socket, which can be a little tricky, with various connectors and all. For testing purposes, you could try to solder another (simpler) jack socket with a piece of shielded cable direct to pin2 on V1 and ground. Obviously, if that works, your chassis mounted jacksocket is wired wrong.  Cool

Thanks for the replies guys

I have no noise level at all even with volumes cranked and od engaged there is nothing
I do get a audible click or pop when I flick the standby switch on
I will try and hook up a jack to pin 2 and see if that works










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RiffRaff
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« Reply #7 on: November 12, 2009, 03:30:40 PM »

Hey perhaps one of relays is turned the other way around.  Grin



I've checked and they are in the correct way
Thanks
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tonym
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« Reply #8 on: November 12, 2009, 07:18:35 PM »

Don't talk to me about relays  Cheesy
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RiffRaff
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« Reply #9 on: November 12, 2009, 08:38:46 PM »

Ok, hooked up a jack from tip to pin 2 and sleeve to ground and still got nothing, no sound what so ever
so i guess it's not the input jacks
it's kinda fun tracking this down
wish I knew what I was doing
so what do I do next?
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tonym
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« Reply #10 on: November 12, 2009, 09:04:07 PM »

Hi Tim,

This is not an HRM right? I know the amp is a bit different than the HRM, but I did a video including the problems I had. It might not actually tell you what your problem is, but you might get some pointers from the stuff I had videod at the time.

My problems revolved around basically the extra little boards (not the main boards). Nik talked about those extra boards being very picky about how much solder to use - too much and they form balls of solder which he said could distort the boards if overtightened and had caused trouble before. Funny thing was, that although my problem appeared to relate to one channel, it was actually there on everything - and when the output 'went off' it became VERY hard to find.

I checked all the connections on all those boards - in my case it did not make a difference, but Nik was very specific about that. All the same, I would check for too much solder, because he was so specific about that problem and the aggrevation it had caused before. Also slack off the non main boards from being too tight and see if the thing works.

Remember its not always wired wrong. In my build I did not have a single wire in the wrong place...

Nik also referred to bad dressing of cables - check that too.

My Power amp also worked perfectly - and I could even drive it with a pedal....  perfect - but the preamp was not.

« Last Edit: November 12, 2009, 09:08:06 PM by tonym » Logged

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hywelg
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« Reply #11 on: November 13, 2009, 12:12:39 AM »


My Power amp also worked perfectly - and I could even drive it with a pedal....  perfect - but the preamp was not.


Check whether this problem is pre-amp or power amp related by pluging a line level input to the FX loop return, this will divide the problem by 2, no output then the problem is topside of your FX return jack, full output then it is the preamp.

Dressing of cables correctly wired will only affect the tone of the output not the existence of output. This is a logical circuit so follow it religiously, checking every wire for correct location and connection. I would recommend an A3 print of the layout and a highlighter pen after each wire is installed. The presence of correct voltages on the test points will tell you whether you have half the circuit right, no output will tell you that your signal circuit is broken or you have a bad valve. Nik will send you a voltage chart that will give you a good starting point for checking, get the voltages right and you are almost there. I think you can safely assume that Niks circuit boards are good until proven otherwise.

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RiffRaff
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« Reply #12 on: November 13, 2009, 01:09:52 AM »

Thanks hywelg
I have sound from the power amp input but not from the front inputs
I have emailed Nik for a voltage chart and hopfully you guys can guide me thru the process
Thanks

Tim
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bluesfendermanblues
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« Reply #13 on: November 13, 2009, 12:01:35 PM »

Just a quick thought - Could it be a fault with the send/return jacks??
try connecting the two with a jack patch cable
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RiffRaff
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« Reply #14 on: November 13, 2009, 03:23:41 PM »

Just a quick thought - Could it be a fault with the send/return jacks??
try connecting the two with a jack patch cable

Ok I tried that and still nothing
on the voltage chart v4 and v5 pin1 shows 37 volts
mine are .026v and .039v
the rest are pretty close
would that be the set of (supposedly) matched tubes I bought off fleabay?
And what does HT stand for and where do I measure that?
« Last Edit: November 13, 2009, 03:26:02 PM by RiffRaff » Logged
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