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Post subject: Re: 1971 Super Reverb
Posted: Thu Jul 06, 2017 8:53 pm
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Location: Coastal Bend, Tx.
Been doing a little researching and have decided to try the stock balance bias as it was when I received the amp 1st. Seems useful in the waning days of NOS tubes or ANOS and how often I buy a pair or even a single that just doesn't match w/in 5 or more milliamps.
Then will mod to both bias & balance. Robinette's site shows the mod. Basically adding another 25K-50K pot via stacking. Sure the chassis will need to be opened to set the bias but the balance adjustment will remain stock. This doesn't change the mods to blackface the circuit resistors and looks like a good solution overall.


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Post subject: Re: 1971 Super Reverb
Posted: Fri Jul 07, 2017 7:23 am
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sfceric64 wrote:
Been doing a little researching and have decided to try the stock balance bias as it was when I received the amp 1st. Seems useful in the waning days of NOS tubes or ANOS and how often I buy a pair or even a single that just doesn't match w/in 5 or more milliamps.
Then will mod to both bias & balance. Robinette's site shows the mod. Basically adding another 25K-50K pot via stacking. Sure the chassis will need to be opened to set the bias but the balance adjustment will remain stock. This doesn't change the mods to blackface the circuit resistors and looks like a good solution overall.

This is where I placed my bias pot in my 69 SR as I did not have use for the polarity switch,then I put the switch in a box of the original used and burnt up parts ( caps and original vibrato bug and the likes ), and I do not have to pull the chaise when trying to bias :wink: I also kept the balance pot, best of both worlds
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mud


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Post subject: Re: 1971 Super Reverb
Posted: Fri Jul 07, 2017 11:20 am
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A nice non-invasive mod, mud!

8)

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: 1971 Super Reverb
Posted: Fri Jul 07, 2017 11:29 am
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Retroverbial wrote:
A nice non-invasive mod, mud!

8)

Arjay

Thanks and if needed can be easily restored to original, but at this point I have no intention of doing that as long as I own it.
mud


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Post subject: Re: 1971 Super Reverb
Posted: Fri Jul 07, 2017 11:55 am
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mud wrote:
and if needed can be easily restored to original


I used a similar approach to add a standby switch to my 1965 Princeton Reverb. Totally reversible.

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: 1971 Super Reverb
Posted: Fri Jul 07, 2017 10:47 pm
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Quote:
:wink:I also kept the balance pot, best of both worlds
Thanks for the idea Mud. :mrgreen: I will gladly borrow that. Did you use a 10k or 100-ohm pot, or perhaps an older version? Those seem to be the only sizes available on a quick scan of places I have bought from recently. I'm guessing you ran a separate wiring leg from the bias board to the new pot and left the original pot wired as it was installed.

Got the PB email bomb this afternoon. So I will spend some weekend time to re-locate to a new photo hosting site in an effort to keep the current posts relevant w/ pics.


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Post subject: Re: 1971 Super Reverb
Posted: Fri Jul 07, 2017 11:53 pm
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sfceric64 wrote:
Got the PB email bomb this afternoon.


If/when I get mine, I'm going to tell them to rapidly and repeatedly impale themselves anally with a "marital aid". No lube.

And at that point I guess I'll be done here......

:(

Arjay

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Post subject: Re: 1971 Super Reverb
Posted: Sat Jul 08, 2017 6:29 am
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Well I didn't want to extend them the curtesy of using my link address for a free mention of their name on each of my posts. So I went and deleted the link in these last two threads, followed by deleting all the pics on my 10+ year old PB account and then terminating the account.
I use Yahoo, so went w/ a flickr account. just did the 1st upload and dropped in to see how the re-post works out.

Well, slight learning curve. Haven't figured it out completely but it worked. Didn't upload all the pics but got the basic pics back up in the thread.


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Post subject: Re: 1971 Super Reverb
Posted: Sat Jul 08, 2017 9:26 am
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Looks like all of my pics are gone.

Guess I'll be moving on shortly.

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: 1971 Super Reverb
Posted: Sat Jul 08, 2017 7:29 pm
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Mine are back. A little jumbled. Guess PB has had some serious hacking issues.

:evil:


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Post subject: Re: 1971 Super Reverb
Posted: Sun Jul 09, 2017 12:04 am
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The only thing they seem to be trying to hack is our wallets.

:x

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: 1971 Super Reverb
Posted: Sun Jul 09, 2017 12:02 pm
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I'm a little late to the party, but my 71 champ has J Castillo stamped on it as well.


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Post subject: Re: 1971 Super Reverb
Posted: Mon Jul 10, 2017 10:05 am
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JasonSD wrote:
I'm a little late to the party, but my 71 champ has J Castillo stamped on it as well.

Nice, I don't know much about the name/date stamps beyond the early years. Might be the final inspection/QC before the chassis was joined to its cabinet. The Tweed days were different, usually the amps cabinet were put together and were stockpiled. When orders came in the chassis was completed, usually by a single person depending on the size of the order and then the speaker added and the amp tested.


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Post subject: Re: 1971 Super Reverb
Posted: Mon Jul 10, 2017 10:20 am
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Cabinets were stockpiled even during the blackface/silverface era. Completed chassis's would be mated to their enclosures in the assembly shop then the speakers would be installed. ALL amps were subsequently tested for QA/QC compliance by a team of guitarists familiar with each model's performance characteristics. Only those that passed were sent to the packing facility for shipment to dealers. This last critical phase was discontinued by FMIC over a decade ago, leaving dealers and service centers to deal with the lemons.

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: 1971 Super Reverb
Posted: Mon Jul 10, 2017 11:20 am
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Retroverbial wrote:
This last critical phase was discontinued by FMIC over a decade ago, leaving dealers and service centers to deal with the lemons.

Arjay


That sucks. What's next, a deductible on the warranty?

UN


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