Hi, anyone want to figure out what happened to this Fender PT July 31st 1970?

[mikeymike]

The bias circuit is covered in yellow-golden colored residue

did you smell it?
having cleaned up suicidal caps many times, they have a unique smell and golden yellow is a typical EDIT color, but I have started and it is good and my ace hardware brass isn't melting and I didn't catch any fish today 

I'm not sure I understand what you're saying but it does have a sort of headache inducing kind of smell

as for the rest of your response I'm very lost  sorry to hear about the bad luck fishing though haha

[sluckey]

Hang around long enough and it will begin to make sense. If not, you need to visit the bait shop one day. I sure hope to.   

[mikeymike]

Hang around long enough and it will begin to make sense. If not, you need to visit the bait shop one day. I sure hope to.   

i guess i need to

[shooter]

i guess i need to

When you troubleshoot for a living after the learning curve you accept the fact; yesterday it was working fine, today NOT, so you isolate, repair, calibrate and go live life.  the system was designed to work, is proven, so why it failed is ALWAYS the same.

WHY is extremely important if you're designing a new/upgraded widget, then analyze, do math, etc.

[PRR]

I decided to search for the meaning of Jibber Jabber being not exactly sure...  I might feel that I could be one of them? I learned english mostly from...

No, not what Slucky meant. Yes, use of English is confusing and when someone speaks Spanish or Korean around me I do think "jabber". But they are talking properly (I assume) and I just don't understand their language.

I think what Slucky was saying is that there are internet posters who make up their own language and nobody else can say if they are right or wrong. Here's a sample from somewhere else:
",,,OK back to waht i am very curious about.
Do you know the 2 tiny thin wires leading from the main board to the RCA posts (CD player/pre amp , amp) and speaker posts (amps),, the one super thin red and 1 super thin black,,,even my jadis Defy loaded with all sorts of caps, resistors , etc etc,,huge trans..OK,, so here goes,,,how is it possible that all those pieces work together to make ,,,let me see, how can i explain,,how can all that electronic pieces end up going througha tiny wire?
and who knows the wire does not appear to be any special wire at all. could be copper.
But it is so thin,,how doesa huge tube amp processes end up going via tiny thin wire...which is why i bought 1mm pure silver and 1/5 mm pure silver wire (with sleeves) and will have my tech guy choose either one,,I think the 1mm is thick enough,,,and swap out the cheap 2 cent wires for pure silver in my Jdais and cayin cd player. .
The 1.5 mm i am sure of is 2x's the thickness of jadis's wire. The cayin cd player's wires are tiny.
With these new 1mm or 1.5(even more beefy!!) replacing that cheap wire,,should i not hear a better resolution, As now the wire is thicker and will aloow the troup of soldiers a cleaner/broader pathway to travel on...
..Or are you saying,,had i done my basic homework witha few old early 20th C basic physics books on electricity,,i may have realized what mods will work,,,and which are,,,,
pure snakeoil...
As everyone here knows, the audiophile INDUSTRY stinks with snake oil scams,,,been that way for decades,,and still continues.
I always to seek the Real deal in all things audio,. which is why i have SEAS Thor speakers and cayin cd player 17, mark1. + the jadis.
So how can folks drink this snakeoil and not feel ill afterwards??"
_____________________
  
Don't put that in Translate. The Internet would crash.

Google Translate and comparing it with Bing and often stunned in a bad bay at the results.

Your posts have been excellent English, better than many "native speakers". Only a few hints that it is new for you. However those few words baffle me. "Bad bay" even sounds like good english slang! (Bad way?)

[mikeymike]

WHY is extremely important if you're designing a new/upgraded widget, then analyze, do math, etc.

It's also important if you're trying to prevent future occurances of failures

the system was designed to work, is proven

I wouldn't assume that, considering the caps in the bias circuit were underspec'd from the factory. Hence WHY matters.

This is all said respectfully, of course. (and maybe even a touch sophmoric  )

[Greg]

Thanks PRR, I understand, no problem at all, really. It's just self doubt being easy triggered. I do find some of my explanations being tedious when I re-read myself.  But face to face talking with a beer, I would dismiss all this with a good laugh.

I have been genuinely welcomed 2 years ago by Sluckey himself on this forum. I have absolutely no doubt about his good intentions and sincerity and I am very well aware, sneaking here from time to time, of his generosity,  patience and contributions on this forum. I enjoy many degrees of humor from all of you, and often have a good laugh reading posts, especially yours, on this forum.

Enough of the bromance.

That google translate explanation on my part was not very honest or accurate, I do type phrase in english to see if they make sense in french (not the other way around) and when I'm satisfied, I leave it. And for the «Bay» typo, I can't blame it on QWERTY either. That letter is not even in the vicinity!


So Mike, hope this cold case brought attention to your underrated cap, enjoy your amp and sorry for this hijack!

Regards,
JP

[sluckey]

Greg, did you think my jibber jabber comment was aimed at you? No way! That was just an open statement meant for poking fun at this thread. It was not meant for anyone in particular. Heck, I've been one of biggest jibber jabbers in this thread! 

[mikeymike]

It's just self doubt being easy triggered. I do find some of my explanations being tedious when I re-read myself.  But face to face talking with a beer, I would dismiss all this with a good laugh.

I relate heavily to this.

So Mike, hope this cold case brought attention to your underrated cap, enjoy your amp and sorry for this hijack!

I'm not even remotely worried about it my man. Didn't bug me at all

Heck, I've been one of biggest jibber jabbers in this thread! 

thems fightin words because I went out of my way to jib jab it up. 

[sluckey]

Just wait til tommorow when shooter opens the bait shop! 

[mikeymike]

Just wait til tommorow when shooter opens the bait shop! 

somehow i don't think it's a real bait shop

[Greg]

Greg, did you think my jibber jabber comment was aimed at you?

Ha ha... no, not directly...like I said, I kind of just felt like I could be one of them. Didn't know the expression at all. At first, I thought about someone eventually throwing a jab verbally... Blatant style. When I got to Urban Dictionnary I got a different answer No worries... PRR's quote explains it all though, I must admit I like the « How can all that electronic pieces going througha a tiny wire» That is some imagery    

[Ed_Chambley]

Just thought I would mention.  When you amp was made it was designed to run on 117VAC in the primary.  I am willing to bet the improper bias cap wasn't improper voltage during manufacturing even though the Schematic states -51VDC, but at the tube it would be much less.  Now you are reading over -60 VDC.  Using a 100 volt cap is best, but I have played a LOT of Blackface Fenders that have not has Bucking Transformer.  The largest problem is you heaters are generally over 6.3 VAC.


Search for building a Bucking Transformers.  I have installed one on every old amp I have.   Even Blond amps that take 110 VAC.  Search for how to make a bucking transformer for a tube amp.  See if you can get the proper voltages, very close to 117VAC.


Now you can consider this jibber jabber, but every amp I have placed in the proper voltage area sounds like it should.

[PRR]

> bet the improper bias cap wasn't improper voltage during manufacturing even though the Schematic states -51VDC, but at the tube it would be much less.

No, it shows 51V *at the cap*. Even the drasftman should have called "Hey?" on this. Maybe Leo knew best. Or maybe Leo just copied a lower-volt amp and missed this detail.

Indeed I have run 36V on 35V caps for decades (intermittently). Maybe Leo was out of 75V caps, and figured it would work for months, so becoming a Customer Repair instead of a Warranty Expense.

And the voltage at the Grid will be "same", because grid current is "zero". It looks less *when you poke it* with a meter because meter-loading. (And because grid-current is non-zero, a worst-case tube could be 5V off, probably -negative-, but more likely <1V off.)

[Greg]

It looks like a common error on some Fender amps. Here's another potential firecracker, an earlier version of the pro. Looks like it was copied from a Deluxe.  Can't be more flagrant than this, the draftmen actually wrote the real voltage, which can go up a few volts if there isn't too much resistance in the power supply...

[st]

Fair enough, what questions would actually allow for a discussion instead of a default to "go look it up on google"? If speculating what happened to the amp is a moot point and discussing the type of failures that might happen with the bias caps being too low of a voltage is something of a google-able offense what type of inquiry would actually get the conversational juices flowing? Any tips on where to take this if not here? I don't mean to say this in any kind of offending manner, I just don't see an in on where to start a discussion. I've tried 

Grounding schemes. Your questions on grounding schemes will be answered a million times over...

[mikeymike]

Grounding schemes. Your questions on grounding schemes will be answered a million times over...

hahaha, I'm guessing that's a never-ending topic of choice here?

[shooter]

somehow i don't think it's a real bait shop

hey, it was, red's, crawlers, wax an mousses.  but we mainly sold beer n gas and sugar.

I did find a truly original bait/tackle store in Blakely GA Nice 'ol guy but he sold defective worms