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Post subject: New Feature - Static has Arrived on my SRRI
Posted: Sun Jul 13, 2014 8:14 am
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Greetings,

Three weeks of perfect operation and I go a bit mental. This amp was deathly quiet in idle position until I decided to try the Premier Guitar rag mod of swapping tubes to hot rod my Super. I should've know better.
I stuffed in brand new Mullards & Tung Sol tubes and a balanced JJ ECC83s in the phase inverter as per the article. V1 was pulled out completely and left empty.
Well, the earlier break up was there and, the volume was much lower, but tonally, not to my liking. I even stuffed in some JJ6V6s tubes in there as they are able to handle the plate voltage stuff - in writing and, per Michael @ Eurotubes.
So, I put everything back to stock with the Groove Tubes. Now, the amp has an irritating 'static' and periodic crackling which did not exist before I went screwin' around.

Any ideas??


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Post subject: Re: New Feature - Static has Arrived on my SRRI
Posted: Sun Jul 13, 2014 9:58 am
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Static and crackling could be a bad preamp tube, bad Plate resistor(s), poor connection in a tube socket, or even poor solder joint(s). The easiest thing to try would be to swap each preamp tube with a known good one, trying the new tube in each position one at a time.

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Post subject: Re: New Feature - Static has Arrived on my SRRI
Posted: Sun Jul 13, 2014 10:28 am
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shimmilou wrote:
Static and crackling could be a bad preamp tube, bad Plate resistor(s), poor connection in a tube socket, or even poor solder joint(s). The easiest thing to try would be to swap each preamp tube with a known good one, trying the new tube in each position one at a time.


+1

As well, it may be necessary to re-tension some or all of the tube sockets.

Arjay

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Post subject: Re: New Feature - Static has Arrived on my SRRI
Posted: Sun Jul 13, 2014 10:33 am
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http://billmaudio.com/wp/?page_id=171

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Post subject: Re: New Feature - Static has Arrived on my SRRI
Posted: Sun Jul 13, 2014 12:10 pm
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shimmilou wrote:
Static and crackling could be a bad preamp tube, bad Plate resistor(s), poor connection in a tube socket, or even poor solder joint(s). The easiest thing to try would be to swap each preamp tube with a known good one, trying the new tube in each position one at a time.


Simple fix .. I shoulda known instead of asking an embarrassing question. V3 12at7 was bad. Stuffed an ECC81 and she's back to being quiet as a door mouse.
Thanks!


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Post subject: Re: New Feature - Static has Arrived on my SRRI
Posted: Sun Jul 13, 2014 12:19 pm
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No embarrassment is warranted IMO.

That you remedied the issue is a testament to your own common sense.

Rawk on!

Arjay

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Post subject: Re: New Feature - Static has Arrived on my SRRI
Posted: Sun Jul 13, 2014 3:00 pm
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Retroverbial wrote:
No embarrassment is warranted IMO.

That you remedied the issue is a testament to your own common sense.

Rawk on!

Arjay


+1 And you learned another lesson, you can't make a Super Reverb sound any better than they already do!

T2

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Post subject: Re: New Feature - Static has Arrived on my SRRI
Posted: Sun Jul 13, 2014 3:34 pm
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T2Stratman wrote:
+1 And you learned another lesson, you can't make a Super Reverb sound any better than they already do!


Indeed. The SRRI's fundamentals are solid. Just a minor bias-supply tweak and some better speakers is all it really needs.

Arjay

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Post subject: Re: New Feature - Static has Arrived on my SRRI
Posted: Mon Jul 14, 2014 6:46 am
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I had the same problem when I started changing tubes, I sprayed the tube pins with Deoxit D5 and worked the tube in a few times its all good now!!!!! even do the power tubes for a solid connection.


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Post subject: Re: New Feature - Static has Arrived on my SRRI
Posted: Mon Jul 14, 2014 7:22 am
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ken361 wrote:
I had the same problem when I started changing tubes, I sprayed the tube pins with Deoxit D5 and worked the tube in a few times its all good now!!!!! even do the power tubes for a solid connection.


If the static comes back, you may want to resolder the wiring into the sockets. The new lead-free solder can be an issue with points under the most temperature changes. Like sockets. Just draw up the old stuff and re-flow good lead/tin solder. I like Kester 60-40.


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Post subject: Re: New Feature - Static has Arrived on my SRRI
Posted: Mon Jul 14, 2014 7:39 am
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Ok thanks


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Post subject: Re: New Feature - Static has Arrived on my SRRI
Posted: Sat Jul 19, 2014 5:38 am
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bluezguy09 wrote:
shimmilou wrote:
Static and crackling could be a bad preamp tube, bad Plate resistor(s), poor connection in a tube socket, or even poor solder joint(s). The easiest thing to try would be to swap each preamp tube with a known good one, trying the new tube in each position one at a time.


Simple fix .. I shoulda known instead of asking an embarrassing question. V3 12at7 was bad. Stuffed an ECC81 and she's back to being quiet as a door mouse.
Thanks!

This surprises me. Unless I misunderstood, the amp had previously not had the static problem in it's factory stock setup. You did some 'experimentation, then replaced all the original tubes and essentially reset the amp back to stock. It was then that amp demonstrated a problem. Correct?

If that is correct then I would have assumed there to be a problem with a tube socket. I'm also wondering if there still might be a minor tube socket problem and you just happened to get a proper connection with the ECC81.

Just speculating - I am not an amp tech by any stretch of the imagination.

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