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Reverb Tank: what make/model for a 1967 Frankenstein head? [message #16500]

Tue, 13 December 2011 13:42

Kustom135
Messages: 1
Registered: March 2005
Location: Toronto

Junior Member

Hi,

I need to know what make and model of reverb tank I can put in my 1967 Frank head.

Thanks!
John

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Re: Reverb Tank: what make/model for a 1967 Frankenstein head? [message #16501 is a reply to message #16500]

Tue, 13 December 2011 14:03

chicagobill
Messages: 2006
Registered: April 2003

Senior Member

The correct replacement is an Accutronics 4FB2C1A. I have not seen the new Korean made tanks or tried them in a Kustom head yet, so I don't how well they work, but there are still NOS US made ones out there.

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Re: Reverb Tank: what make/model for a 1967 Frankenstein head? [message #16564 is a reply to message #16500]

Mon, 09 January 2012 01:03

glenjones
Messages: 1
Registered: January 2012
Location: Washington

Junior Member

Even I think 4FB2C1A is the exact replacement for the older reverb tank.but if not you can take 4FB2A1A it is probably the closest one!!

mobile POS

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Re: Reverb Tank: what make/model for a 1967 Frankenstein head? [message #16664 is a reply to message #16564]

Wed, 08 February 2012 17:59

cassent5150
Messages: 341
Registered: August 2009

Senior Member

Holy Crap!!! The 4 F B has 1475 ohms in and 2250 ohms out. I thought they wanted to see 180 ohms in and out. I've been replacing them with a short tank type 1. Got one here in my hand typical to what I use and it is testing out at 200 ohms in and 175 out. The result I get is a real (Fender Twin Type Reverb)deeeeeeeep reverb ability and if you locate it correctly in the chassis or cabinet top of the Frank models it doesn't hum or squeal when ya turn it up. I got 2 Franks here I've restored and have it in both. I like the longer Type 4 or 9 for overall sound but the short 1 or 8 is working pretty good for me. I'm not a tech by no means but I thought I could share some options I found useing vintage parts I find all the time on ebay. I do notice sometimes I have to ground the tank to the chassis to get it to work and other times I dont depending on the connector design of the reverb. For instance I like the (MOD 8BB2A1B) ones I get off Ebay with the Medium Decay even though the mounting plane is usualy B on those suitable for me. The grounds can be lifted to suit the circuit just by unsoldering the junction on the inside of the RCA jacks. Output impedance is more that I thought I wanted but it works fine. Well thats my penny and a halfs worth. Steve C

Steve C

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Re: Reverb Tank: what make/model for a 1967 Frankenstein head? [message #16665 is a reply to message #16500]

Wed, 08 February 2012 18:06

chicagobill
Messages: 2006
Registered: April 2003

Senior Member

Steve you have to remember that impedance is not the same as dc resistance, which is the 180 ohm value that you mentioned.

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Re: Reverb Tank: what make/model for a 1967 Frankenstein head? [message #16666 is a reply to message #16665]

Wed, 08 February 2012 18:39

cassent5150
Messages: 341
Registered: August 2009

Senior Member

You learn something new every day. Thanks, I didn't know that. I guess the next question would be what is impedance and how do you test it? I was under the assumption resistance and impedance both meant the same thing, to resist or impeed meaning the same thing.

Steve C

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Re: Reverb Tank: what make/model for a 1967 Frankenstein head? [message #16667 is a reply to message #16500]

Wed, 08 February 2012 19:42

chicagobill
Messages: 2006
Registered: April 2003

Senior Member

The short answer is that impedance deals with ac signal loads, dc resistance deals with dc voltage.

To measure impedance you need to inject an ac signal into a load with a series resistor and measure the signal drop. I'd have to look up the specifics to give a more accurate formula and test procedure.

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Re: Reverb Tank: what make/model for a 1967 Frankenstein head? [message #16669 is a reply to message #16500]

Thu, 09 February 2012 06:10

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

If you go to the Accutronics site there transducer chart list both the impeadance in ohms, and the DC resistance.

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Re: Reverb Tank: what make/model for a 1967 Frankenstein head? [message #16671 is a reply to message #16669]

Thu, 09 February 2012 16:21

cassent5150
Messages: 341
Registered: August 2009

Senior Member

OK, that all sounds pretty complicated except for the Acutronics chart. I guess so far I've been lucky. I always try to get one with low ohms at input and output thinking 180 ohms as my target on input and output. Is it damaging to the circuitry if the impedance is wrong or will it just effect the performance of that circuit?

Steve C

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Re: Reverb Tank: what make/model for a 1967 Frankenstein head? [message #16672 is a reply to message #16671]

Thu, 09 February 2012 16:33

Kustom_Bart
Messages: 601
Registered: October 2010
Location: Greenville, MichiGUN

Senior Member

You guys are waaaaay over my head, but I love reading this stuff and locking it into the memory bank...lol! Good stuff!

I have a tough time reading a schematic but I am getting better. I have a guy here about 2 miles away that is a old timer tech that does all kinds of weird stuff...the more strange it is the better he likes it. Juke boxes, old Fender and Kustom amps, boards, powered and non powered, old bar video games etc. I have known him since I was about 5 yrs old. He was friends with my dad. He takes pretty good care of me as I always bring him cool stuff to repair and a schematic. normal cost is about 40.00 to repair a Kustom.

I have tried to get him to let me come and help him to learn something as he keeps saying he is going to retire....but he is hesitant to do so.

Bart

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Re: Reverb Tank: what make/model for a 1967 Frankenstein head? [message #16674 is a reply to message #16500]

Thu, 09 February 2012 17:37

chicagobill
Messages: 2006
Registered: April 2003

Senior Member

Well if the impedance is mismatched there will be a loss of signal strength and frequency response. Have you ever tried plugging in a low impedance mike into the front of a Kustom amp without a matching transformer?

If you use the wrong tank it won't hurt anything electronically, but it will either not sound right or it won't pass signal at all.

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Re: Reverb Tank: what make/model for a 1967 Frankenstein head? [message #16676 is a reply to message #16674]

Fri, 10 February 2012 01:01

cassent5150
Messages: 341
Registered: August 2009

Senior Member

Fair enough I'll heed that advice. Thanks

Steve C

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