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Post subject: Re: White ground wire from tremolo to bias pot?
Posted: Wed Jan 11, 2017 10:19 pm
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Roadie
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On top of that I had told the tech in question not to make any changes in the amp because it was very valuable to my friend. While making the change to bias adjust, he completely snipped off the fourth pin of the bias balance pot, molesting the amp. By the grace of God, I located another silverface 4 pin pot.


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Post subject: Re: White ground wire from tremolo to bias pot?
Posted: Thu Jan 12, 2017 2:49 am
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Sure it is not a qualified tech who fix the amp if what you say is right.
Lots a good handymand on forums, but are not tech.


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Post subject: Re: White ground wire from tremolo to bias pot?
Posted: Thu Jan 12, 2017 3:06 am
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Krankster wrote:
By the grace of God, I located another silverface 4 pin pot.


You are lucky! Those are hard to find.


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Post subject: Re: White ground wire from tremolo to bias pot?
Posted: Thu Jan 12, 2017 3:20 am
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Krankster wrote:
By the grace of God, I located another silverface 4 pin pot.



Waste of time to return to balance pot and not useful :(


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Post subject: Re: White ground wire from tremolo to bias pot?
Posted: Thu Jan 12, 2017 11:16 am
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Professional Musician
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There have been a few cases where I have changed a bias balance to bias adjust. Usually it is a case where the tubes aren't safe to use unless the bias is lowered.
I prefer to install new tubes of the correct gain range and adjust the balance to zero out the hum.
Unfortunately many of my customers are poor musicians and balk at the notion of spending $100 on a set of tubes. The amp still works and they want to squeeze every last drop out of them.
Obviously, your tech didn't do you any favors by his mods. But was he trying to save you buying tubes. I don't know.
I do expect he didn't do it just for fun, but to resolve an issue.

If you want to set it back to stock, that is not a bad idea in of itself. But get a new set of power tubes with a low gain to match what the amp expects.
This is an issue with many amps. They don't have a bias adjust or have a limited range.
On these amps, Fender, Mesa, and Peavey, to name a few, the factories seem to select low gain tubes for production.
The replacements I receive from aftermarket suppliers are generally too high gain to bias properly without circuit modification.
I know I can order low gain tubes from them, but the numbers on the tube matching labels often have different specs measured and I have no baseline to compare to.
Fender groove tubes have a simple red, white, and blue ratings, but again, there is no baseline of information as to what their colors measure out to.

I'm guessing all the factories use the entire supply of low gain tubes for production and leave the aftermarket with the high gain leftovers.
This makes it difficult to expect replacements to actually work properly in an amp designed for low gain power tubes.


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Post subject: Re: White ground wire from tremolo to bias pot?
Posted: Thu Jan 12, 2017 12:04 pm
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TimsAudio wrote:
Unfortunately many of my customers are poor musicians and balk at the notion of spending $100 on a set of tubes.


Yet like Pavlov's dog, they'll eagerly drop eight or nine hundred bucks every year for a new phone or whatever piece of iJunk that Apple happens to be peddling at the time.

:roll:

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: White ground wire from tremolo to bias pot?
Posted: Thu Jan 12, 2017 9:23 pm
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Professional Musician
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I've never understood the attraction to the symbol of a bitten apple. It didn't work out so well for Eve or Snow White.
There is no symbol that is more associated with deceiving the innocent and I can't understand how any ad man could turn it into anything else.
Behind the closed archetecture and the exhorbitant price of your average iJunk, the appeal to our vanities to have the "smartest" phone around begs the question. Well if your dynamic duo has the smart one leaping out of a little box, where does that leave you, Robin?.

For the record, I've never owned a cell phone. Dangerous radiation.


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Post subject: Re: White ground wire from tremolo to bias pot?
Posted: Thu Jan 12, 2017 10:30 pm
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Smart phone my yass......

I don't even have a dumb phone!

:lol:

Arjay

_________________
"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: White ground wire from tremolo to bias pot?
Posted: Fri Jan 13, 2017 3:16 am
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I have no cell phone.
I have a window PC and since I discover Mac, I put my PC on garbage. I was an anti-Mac. I just try both and see.
Most people I know who have Window PC buy a price not quality. Or they are too "old " to change.


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Post subject: Re: White ground wire from tremolo to bias pot?
Posted: Fri Jan 13, 2017 8:57 pm
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My anti-Apple attitude comes from their consistent refusal to give the customer what they want.
Leaving out the Disk drive was an inconvience many customers didn't want, but it made production cheaper. Too bad if you had software you still want to use.
Leaving out a headphone jack and expecting you to buy $125 microwave transmitters to fit in your ear just so they won't have warranty claims for water inundation is not customer service. Its greed.

Can you imagine if Fender sold a guitar that only worked with their amps? Or an amp that needed a separate remote control to operate it.

I haven't seen an Apple product that was not available in PC.
Can you enlighten me on what is the operating benefit of a Mac over a PC.for usual computer work. I hear their photo editing is good, but I don't use any of that. My 20 year old PC has been an updatable workhorse.


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Post subject: Re: White ground wire from tremolo to bias pot?
Posted: Sat Jan 14, 2017 3:01 am
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TimsAudio wrote:

Can you enlighten me on what is the operating benefit of a Mac over a PC.for usual computer work. I hear their photo editing is good, but I don't use any of that. My 20 year old PC has been an updatable workhorse.


It just more easy to use a Mac. Very very user friendly. No more headhache .

Yes some apps for some kind of business might not be available. I heard that long time ago, I don't know now. I always find what I need and I do lots of thing on my Mac, not only mails.
You can run also run Microsoft apps on a Mac if you want .

For most of us, you 'll find always what you need with Mac's apps ( software ) .
And no need anti-virus, my experience with 3 Macs at home since 2011

If you don't know how to do something with you Mac, or for any problem ( if you are a beginner ) ; Free help and fix at any Apple Store, or just over a phone .

Just have a look around you, you'll see more people leaving Microsoft pc for a Mac.
If price where the same for both, you probably won't see many Microsoft PC


Did I say I had ( we had at home ) a Microsoft PC before ? I try both.

The story begin when one of my brother who have a Mac ( I have a good Toshiba Microsoft pc ) tell me the his Mac is dead and he buy a new one because it is too expensive to fix it. He tell me that he 'll put his "old" Mac in garbage, I ask him to give it to me.

Long story short ; I fix it at zero cost ( some update and reload ) and I learn to use it. From this time I and my wife too, never use the Toshiba. Both computer was the same years.


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Post subject: Re: White ground wire from tremolo to bias pot?
Posted: Thu Apr 26, 2018 2:14 am
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Aspiring Musician
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Joined: Thu Dec 12, 2013 2:54 pm
Posts: 618
Sorry to dredge up an old post, but I found this while searching for a post about BF VS. SF output transformers.

Image

My 10 year old Dell laptop running Apple OS x 10.6. Most of the time I boot it in to Windows. Just include me with the geezers that aren't interested in changing, but enjoy a challenge once in a while.


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Post subject: Re: White ground wire from tremolo to bias pot?
Posted: Thu Apr 26, 2018 5:49 pm
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Rock Star
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Joined: Sat Jul 03, 2010 2:18 pm
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Nice RSD pickup! I got this one from Newbury. :mrgreen:

https://www.newburycomics.com/products/ ... 5301663756

Image


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