Help... What size wire?

Dick Sexton · From: Greenville, Ohio

What size copper wire is used on the windings of the Accutronics Reverb tank coils.

Thought I'd ask, in the chance, some of you techs might know. Right now, I'm stuck with very small, because that is the limit of my measuring ability with the knowledge I have. I'm guessing a high number, 50 or 60, but really need to know.

Any help appreciated.

Or a way to measure it, "Cowboy method preferred".

Thank you...

Dave Grafe · From: Hudson River Valley NY

Really tiny, Dick, and not really worth messing with as you can get a new replacement for under $40 shipping included - http://www.accutronicsreverb.com/

Dick Sexton · From: Greenville, Ohio

Just a an up date on how tiny... I pulled one of the bad coils off today and unwound the, "small as hair" copper wire. 1700 turns on the bobbin, unwound and counted 10 turns at a time. I could tell that they had been machine wound because each coil was neatly next to the others. My plan was to find the right wire and rewind them. Now, I'm not sure I'm up to the task.

Dave I contacted Mr. Steve Winkler the US rep/supplier and was told to go back to the amp manufacturer, Evans, as they sell to builders only. Of course Evans doesn't use what I needed or support the older amps, I was told. If that isn't true and I can get what is needed, I'll sure cease and dissect this winding operation.

I'll spend that time practicing. I need it.

From what I gather, I'm not the only one looking for an Accutronics Reverb tank, pn. 8FB2B1F. Any information would be greatly appreciated.

Pete Burak · From: Portland, OR USA

I see they reccomend a 6 spring unit for Pedal Steel, Type 9.
How do you find out all the other code variables for an amp?...
Input/output impedance?
I need one for a '70 Dual Showman Reverb that was modded to AB763 spec.

Ken Fox · From: Nashville GA USA

Pete, that is a 3 spring (not a 6 spronmg tank). For a Fender amp that would be a 9AB2C1B (medium delay, 3 spring. long tank).

At Antique Electronics:

P-RK-9AB2C1B
Reverb Tank - Accutronics - Made in Korea, Medium Decay, 9AB2C1B
Accutronics Reverb Tank 9AB2C1B.

10 ohm input, 2,575 ohm output, medium decay, type 9, 3 spring.

Made in Korea

RoHS Compliant

Also thre MOD tank(my favorite)

P-RMOD-9AB2C1B
Reverb Tank - Mod, Equivalent to 9AB2C1B, Black Finish
Equivalent to 9AB2C1B, designed to sound like vintage tanks.

Type 9, 10 ohm input, 2,575 ohm output, medium decay, 3 spring.

RoHS Compliant

Pete Burak · From: Portland, OR USA

I see, the 6-spring is actually 6 springs connected together (2 each) to make a 3 spring tank.

I checked the tank in my '76 Vibrosonic last night and it is 4AB3C1B.

The tank in my Dual Showman was grey/silver in color and did not have a code on it that i could find. It is a 2 spring tank though.

I really like the sound of the one in my Vibrosonic.

Dave Grafe · From: Hudson River Valley NY

Maybe this is what you are looking for?

http://bb.steelguitarforum.com/viewtopic.php?t=181671

I sent you a copy of the original document via email, Pete

As for Mr. Steve Winkler only selling to builders, Dick, this is news to me, you might try try contacting Dr. Park directly as I did not too long ago, he was willing to send a single unit to me with payment via PayPal:

C.H.Park / President / CEO
belton@unitel.co.kr
www.belton.co.kr
82-2-2163-0060

Antique Electronics Supply has a few models in stock as well, you night get lucky:

http://www.tubesandmore.com/

Good luck, I'd hate to think of you trying to lay those coils back down there on your own Confused

Pete Burak · From: Portland, OR USA

Thanks, Dave.
Smile

Dick Sexton · From: Greenville, Ohio

Me too Dave, here lately I can't even seem to get my garden hose on its roller in an orderly manner. And it's 3/4"...

Thank you for the Mr. Park info, I'll contact him first before I try to rewind this one.

Pete Burak · From: Portland, OR USA

Dave Grafe · From: Hudson River Valley NY

I prefer the long decay, Pete, it's not that much longer of a tail, but the increased pre-delay that comes with is to my ears a significant improvement.

Unfortunately my long-decay tank busted a wire so I now have type 9 medium decay tanks in both of my Randall amps as it was easier to get a medium on short notice. Either will work very well, IMHO.

Ken Fox · From: Nashville GA USA

Pete, both of those tanks are mudium delay

9EB3C1B or 4EB3C1B would be a long delay.

Pete Burak · From: Portland, OR USA

I have what I think appears to be (ink stamp is hard to read) a 9BB1C1B tank in a Session 400.
'Not sure if it is even right for the Session 400, but would it be safe to give it a listen in a Twin Reverb? Or can you damage the circuit with an input/output impedance mismatch?
This tank from the Session 400 also has RCA's, so it would be an easy connection.

Ken Fox · From: Nashville GA USA

That is the wrong tank for a Peavey or a Fender amp. The input impedance is too high for a Fender.

Fender tube amps tanks are typically
4AB3C1B, input impedance around 8 ohms,

The tank you have is a 150 ohm input impedance, typical in a Musicman amp.

Pete Burak · From: Portland, OR USA

Thanks Ken.
What is your favorite tank for a 70's silver knob Session 400 with RCA jacks?

O.K. last tank...
This one I can't figure out is only marked on the inside with a damaged sticker that says "Brevet" and "??? subsidiary of Hammond" ??? Wisconson, and has an ink stamp with 64063 and also a stamp with 4U1.
Any idea? It was in a Dual Showman Reverb but not sure if it was original.

Ken Fox · From: Nashville GA USA

The old Session was a 2 spring
4EB2C1B, medium delay

Later Peavey started giving the steelers the
9EB2C1B, three spring medium delay.

I find the 3 spring adds a darker tone, to my ear. I do care for the 2 spring to much either.

I am anxious to try a 4EB3C1B, 2 spring long delay, more like the Fender tanks. Just have not gotten to it yet. The new MOD tanks are great and I prefer them to the new Accutronics, just a bit! Both are great tanks.

Not sure on that other tank. I actually use a Sennheisser Digital impedance meter to check any unknown tank. Also handy for many other tests in the shop

Bill A. Moore · From: Silver City, New Mexico, USA

Now I find out I need another tool!
Have been using Accutronics resistance charts to figure out the tank impedance. Was not aware of a tool to actually measure impedance
Thanks Ken.

Dave Grafe · From: Hudson River Valley NY

You don't need to measure anything, Bill, I'm not sure what you mean by "Accutronics resistance charts" but the tank's impedance will be listed in the part number, the amp's impedance is a matter of design and specs for most amps are already known.

Dick Sexton · From: Greenville, Ohio

First I'd like to thank all who responded to my thread asking for broken reverb tanks. I received four of them. Thank you...

To Dave Grafe and Ken Fox; using your information, I was able to contact Mr. Park in Korea and get a direct replacement for pn. 8FB2B1F as used in older Evans amps. Currently waiting on a time to install it and do an evaluation of the replacement. I will post my findings and ordering information. Gentlemen, thank you very much!

I have not abandoned the rebuild project, but am still hoping to find the wire size used in the original units. As always, any and all help appreciated.

Michael Brebes · From: Northridge CA

I wouldn't expect it to be smaller than the wire used in pickups, which is usually either 42 or 43 gauge. If you want to match the wire exactly, you will need to measure it with calipers.
_________________
Michael Brebes
Instrument/amp/ pickup repair
MSA D10 Classic/Rickenbacher B6/
Dickerson MOTS/Dobro D32 Hawaiian/
Goldtone Paul Beard Reso

Mesa Boogie Studio Pre/Hafler 3000
RP1/MPX100

Dick Sexton · From: Greenville, Ohio

Thanks Michael, I appreciate the caliper suggestion. It seems to be about the size of a human hair or two thick. May indeed be 42 or 43. I don't have calipers to measure it, I would have tried that. Is there some place I could send a sample to be measured, if it didn't cost for that service. Maybe two places to get a confirmation of the size from two different sources. Wouldn't want to buy a couple hundred feet of the wrong size. That would be bad...

In any case, thank you...

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