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Post subject: fender twin reverb 1965 reissue problem update with pic
Posted: Fri Jan 10, 2014 5:41 pm
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:) Hi, I just got this amp today in trade. I know the amp get some problem but for what I trade.

(My Roland Alpha Juno2 synth. If I make a short story. is a long time this guy want my synth and the guy don't have cash to fix the amp and me I want a clean sound when I play guitar)

My synth for this amp is a joke :mrgreen: event if I need to spend some $$.

The amp power up and I get sound out and the reverb work well. for the tremolo I don't know because I need to buy a footswicht
the problem sometime I got some spark sound when I play bass note on my strat.
same sound when you unplug your guitar when the amp is not on standby
do you think is tube problem
thanks


Last edited by simus35 on Mon Jan 13, 2014 12:06 pm, edited 1 time in total.

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Post subject: Re: fender twin reverb 1965 reissue problem
Posted: Fri Jan 10, 2014 5:49 pm
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simus35 wrote:
do you think is tube problem
thanks


Possibly.

It might also be a cold solder joint or a speaker issue.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: fender twin reverb 1965 reissue problem
Posted: Sat Jan 11, 2014 2:05 am
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Might be many thing .


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Post subject: Re: fender twin reverb 1965 reissue problem
Posted: Sat Jan 11, 2014 10:14 am
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some update
I just realize is probably the reverb ot but not sure.
why I said that because I play without the reverb and no problem at all but when I open the reverb atound 4 or 5 and I start to play I got some time some spark
what do you think
thanks for you help


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Post subject: Re: fender twin reverb 1965 reissue problem
Posted: Sat Jan 11, 2014 4:47 pm
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" some time some spark. "

Whoa! You are getting a "spark," like an electrical short, when you flip on the reverb? Like you SEE a spark? Or just hear it? Where is this spark coming from?

If you are seeing a spark, better not use the amp until it can be looked at by a good tech.


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Post subject: Re: fender twin reverb 1965 reissue problem
Posted: Sat Jan 11, 2014 4:59 pm
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BMW2002Ti wrote:
" some time some spark. "

Whoa! You are getting a "spark," like an electrical short, when you flip on the reverb? Like you SEE a spark? Or just hear it? Where is this spark coming from?

If you are seeing a spark, better not use the amp until it can be looked at by a good tech.

sorry for my bab English
I mean spark for some noise come from the speaker and not like a spark like the lightning


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Post subject: Re: fender twin reverb 1965 reissue problem
Posted: Sat Jan 11, 2014 5:37 pm
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Try carefully pulling each tube, one-by-one, and using a little contact cleaner on the pins and sockets. Work each tube in-&-out of its appropiate socket a couple of times, to clean the contacts.


Hope this work. :D


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Post subject: Re: fender twin reverb 1965 reissue problem
Posted: Sat Jan 11, 2014 5:51 pm
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BMW2002Ti wrote:
Try carefully pulling each tube, one-by-one, and using a little contact cleaner on the pins and sockets. Work each tube in-&-out of its appropiate socket a couple of times, to clean the contacts.


Be sure to TURN THE AMP OFF AND UNPLUG IT FIRST before proceeding.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: fender twin reverb 1965 reissue problem
Posted: Sun Jan 12, 2014 4:48 am
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Retroverbial wrote:
simus35 wrote:
do you think is tube problem
thanks


Possibly.

It might also be a cold solder joint or a speaker issue.

Arjay


Solder IMO


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Post subject: Re: fender twin reverb 1965 reissue problem
Posted: Sun Jan 12, 2014 11:10 am
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Stratele, prolly best to rule-out the tube-socket contact, first. Use a good contact cleaner. Then, go after poor wiring connections and poor soldering.

How many times has poor soldering come up, in these modern amps? I don't get it. Aren't the same manufacturing techniques used in the assembly of flat-screen monitors & TV's? I don't think I've ever heard of a poor solder point in them. :?:


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Post subject: Re: fender twin reverb 1965 reissue problem
Posted: Sun Jan 12, 2014 12:57 pm
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Your typical flat-screen plasma TV ain't bein' manhandled into and out of a car, dragged up (or down) a flight of stairs, then abused by some half-in-the-bag musician night after night after night.

:lol:

Arjay

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Post subject: Re: fender twin reverb 1965 reissue problem Update with pic
Posted: Mon Jan 13, 2014 12:05 pm
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here a pic
I think I found the problem
what do you think
second power tube resistance burn
Image


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Post subject: Re: fender twin reverb 1965 reissue problem update with pic
Posted: Mon Jan 13, 2014 12:08 pm
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Screen grid resistor (470 ohm, 1 watt). You should probably replace the one on each output tube, and use 2 watt replacements.

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Post subject: Re: fender twin reverb 1965 reissue problem update with pic
Posted: Mon Jan 13, 2014 12:17 pm
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shimmilou wrote:
You should probably replace the one on each output tube, and use 2 watt replacements.


Do not over-spec them.

They're there to protect the amp in the event of a runaway tube.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: fender twin reverb 1965 reissue problem update with pic
Posted: Mon Jan 13, 2014 12:20 pm
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Retroverbial wrote:
shimmilou wrote:
You should probably replace the one on each output tube, and use 2 watt replacements.


Do not over-spec them.

They're there to protect the amp in the event of a runaway tube.

Arjay

do you think this they cause the spark boom sound when I play low freq. note.
do you think I will need to buy a new set of tube too :?


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