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Post subject: Re: Super Six Reverb
Posted: Tue Mar 20, 2012 10:16 am
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Whoops......it's time for my monthly mea culpa.

:oops:

The stock speaker for your amp is an 8-ohm driver -- sorry for the misinformation.

To arrive at 5.3 ohms for the original six-speaker array, the speakers are divided into three pairs -- each pair is wired in series, producing 16 ohms. Then these three pairs are wired together in parallel, which yields the 5.3 ohm total.

Arjay

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Post subject: Re: Super Six Reverb
Posted: Tue Mar 20, 2012 1:45 pm
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Ah ha, there's the value needed.

I was wondering why the combo was series conected to the extension series via parallel.
Making 8ohms as combo, 4ohms with extension.

I'll be leaving speakers wired as they are. Now just to get rid of all that noise and scratchyness coming out while the amp idles. Re-cap I would expect.


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Post subject: Re: Super Six Reverb
Posted: Tue Mar 20, 2012 2:40 pm
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A re-cap (filter and bias) would be wise. While you're rooting around under the "doghouse", check out all of the resistors on the power rail. Be sure to inspect the 470-ohm 1-watt resistors laying across the power tube sockets as well. Replace if warranted. Static in an old amp (if not directly attributable to dirty/worn pots) is often the result of a noisy carbon-comp cathode resistor somewhere in the pre-amp section.

Arjay

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Post subject: Re: Super Six Reverb
Posted: Tue Mar 20, 2012 7:00 pm
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AH Yes, the fog is lifting( I think ). The (combo)2-8ohm speakers in series would yield 16ohms. Now if we couple the other cab in parallel, via the ext jack(2-8ohm in series at 16ohms), the result would be 8ohms. Am I missing something? Art

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Post subject: Re: Super Six Reverb
Posted: Tue Mar 20, 2012 7:21 pm
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Thanks for the specific resister tip! This will be the first time for me messing with the circuit of an amp. Except for changing valves. To bias this amp to match my tubes, will I have to swap in/out different resisters (being a fixed bias amp)?

Do you guys also own a super six?


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Post subject: Re: Super Six Reverb
Posted: Tue Mar 20, 2012 11:54 pm
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No Six here, Tim. Have a little experience with the Twin's. Maybe the other guys can zero in on your needs. Art

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Post subject: Re: Super Six Reverb
Posted: Wed Mar 21, 2012 2:17 pm
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Wow. One of the 470 resistors read 698! 2 others read 520, one had been replaced at sometime and read 460. I will replace all 4


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Post subject: Re: Super Six Reverb
Posted: Wed Mar 21, 2012 3:57 pm
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timmyhatch wrote:
I will replace all 4


A wise choice, weed-hoppah.

Use metal-film types for better resistance to thermal degradation (same value, same tolerance).

Arjay

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Post subject: Re: Super Six Reverb
Posted: Thu Mar 22, 2012 5:34 am
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Ok, I was going to replace with carbon comp, as that's what it had. But I like these tips.

Thanks arjay


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Post subject: Re: Super Six Reverb
Posted: Thu Mar 22, 2012 9:28 am
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Good-quality carbon-comps (ie: Allen & Bradley) will last 20 or more years -- if you already have some, I say go ahead and use them. But if you were ordering specifically for your amp or making a trip to the store, the metal-film types are the way to go.

Arjay

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Post subject: Re: Super Six Reverb
Posted: Sun Mar 25, 2012 4:06 am
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Is it worth doing a blackface mod? one of those simple kits from ebay?
I know its not really turning it into blackface tones but would it enhance the SF tone enough to warrant it?

Or just a recap and replace those 470 resistors?


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Post subject: Re: Super Six Reverb
Posted: Sun Mar 25, 2012 7:44 am
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Retroverbial wrote:
Good-quality carbon-comps (ie: Allen & Bradley) will last 20 or more years -- if you already have some, I say go ahead and use them. But if you were ordering specifically for your amp or making a trip to the store, the metal-film types are the way to go.

Arjay

I replaced the two power tube sockets on my Vibrolux Reverb and in doing so used A&B carbon comps....I had thought about using metal film,but the amp sounds great and is quiet,so I'll leave them in....this remark of Arjay's makes me feel better about using them. :D


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Post subject: Re: Super Six Reverb
Posted: Sun Mar 25, 2012 7:46 am
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timmyhatch wrote:
one of those simple kits from ebay?


:lol: :lol: :lol: :lol: :lol:

The job isn't as "simple" as the hucksters selling those make it seem.

Answer one question (parenthetically, to yourself):

Do you like the tone of the amp as it currently is?

If yes then merely re-cap it, re-tube it, re-bias it, and play it.

If not, broom it off for something else.

It's my experience that the lion's share of "backyard blackface jobs" end in utter disaster.

JMO, YMMV, PDOATT, KDTTAH

Arjay

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Post subject: Re: Super Six Reverb
Posted: Sun Mar 25, 2012 2:09 pm
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I do like the SF tone. From what you just wrote, I won't bother pretending it's a blackface via mods.
Now just on the re bias. Is this a relatively easy task, as it's a fixed bias circuit?


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Post subject: Re: Super Six Reverb
Posted: Sun Mar 25, 2012 5:45 pm
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Yep, Totally concur with Arjay on the "blackface" mod. The real job requires the R&R of many components and a rewiring with solid core wire, with max attention to the lead dress. If you were an amp rebuild enthusiast, then I'd say "go for it". It is no simple task to do it right! I'd just keep it simple and groove with your amp. Art.....Sorrry, I overlooked your bias question. Not sure of the exact model, but my guess would be that it is a simple hum balance type. This you can actually do by ear. Of course a measurement of the idle current would be more involved. Art

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