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Post new topic Hiss on new Twin Reverb
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Author Topic:  Hiss on new Twin Reverb
Sigi Meissner


From:
Duebendorf, Switzerland
Post Posted 29 Oct 2017 12:53 am     Reply with quote

I dicided 9 months ago to replace my old 72 Twin Reverb through a brand new one. It's this edition with color caramel ordered from England.
My old on is super quiet while the new one has a considerable hiss. Tried everything without succes. Is it possible to eliminate the hiss?
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Steven Paris


From:
Los Angeles
Post Posted 29 Oct 2017 2:42 am     Reply with quote

Why on earth would you "replace" a 1972 Fender Twin Reverb with one of the new "Fender-in-name-only" pieces of junk?? Your "old" one is MUCH MUCH better than new!!!
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Emmons & Peavey


Last edited by Steven Paris on 29 Oct 2017 9:35 am; edited 1 time in total
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Jack Hanson


From:
San Luis Valley, USA
Post Posted 29 Oct 2017 5:39 am     Reply with quote

What Steve said.
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Erv Niehaus


From:
Litchfield, MN, USA
Post Posted 30 Oct 2017 8:56 am     Reply with quote

If it ain't broke, don't fix it!! Whoa!
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Godfrey Arthur


From:
Philippines
Post Posted 30 Oct 2017 10:03 pm     Re: Hiss on new Twin Reverb Reply with quote

Sigi Meissner wrote:
I dicided 9 months ago to replace my old 72 Twin Reverb through a brand new one. It's this edition with color caramel ordered from England.
My old on is super quiet while the new one has a considerable hiss. Tried everything without succes. Is it possible to eliminate the hiss?


While I agree with the other comments, check the tubes for the hiss problem. Might be V6 in the preamp if it isn't the power tubes.

Buying a new tube amp these days comes with possible problematic "new" tubes.


The new tubes tend to suck...
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ShoBud The Pro 1
YES it's my REAL NAME!
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Billy Murdoch


From:
Glasgow, Scotland, U.K.
Post Posted 31 Oct 2017 12:57 am     Reply with quote

Did You contact the supplier? It should still be under warranty.
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Peter Harris


From:
South Australia, Australia
Post Posted 31 Oct 2017 3:43 am     Reply with quote

My Son (in Australia) had exactly the same problem here...it went back to the dealer for warranty repair....ended up a replacement amp....yours is the fourth one I've heard about...

Peter
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Jim Sliff


From:
Lawndale California, USA
Post Posted 31 Oct 2017 5:02 pm     Reply with quote

Quote:
Might be V6 in the preamp if it isn't the power tubes.


Power tubes do not "hiss".

Excessive hiss in a new amp is a warranty issue, period. If it's louder than your vintage TR it could be a preamp tube, a defective plate resistor, a defective capacitor, a printed circuit board problem - there are a bunch of possibilities, all covered under warranty.

Fender owns Groove Tubes and loads new amps with mid-quality tubes; many gigging players that buy "reissues" replace all the tubes immediately to improve the tone (replacing power tubes requires checking the bias at minimum, which means a tech visit unless you are equipped to do it yourself).

But like others I'm baffled as to the reason for buying a cheaply-made "sort of" reissue when you own a far more reliable and easy-to-service vintage TR. If there are problems with your vintage amp they should be easy to solve by a competent tech.

That design is one of the most bulletproof ever made. Properly maintained, Fender's amps based on the same general circuit are probably the most reliable (and inexpensive to use) hand-wired amps around.
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Godfrey Arthur


From:
Philippines
Post Posted 3 Nov 2017 8:56 pm     Reply with quote

Jim Sliff wrote:
Quote:
Might be V6 in the preamp if it isn't the power tubes.


Power tubes do not "hiss".



There have been reports of swapping power tubes to eliminate a hissing problem.

High gain tube amps may hiss when cranked as nature of the beast.

The OP wasn't clear exactly what was going on, whether the amp is still under warranty or not, or under what circumstance the hiss occurs.

But yes these reissues are hissing as reported by others and some experience it months in after taking possession of the amp.

If under warranty, it's easier to let the dealer deal with it if they are so inclined.

Groove Tubes are re-labels of tubes made outside of conus.
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From the Bronx via Manila
ShoBud The Pro 1
YES it's my REAL NAME!
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Tim Whitlock


From:
Colorado, USA
Post Posted 6 Nov 2017 10:23 am     Reply with quote

Send the re-issue back for a refund. Take your 72 in for a complete checkup/service. Put the money you saved back in your pocket. Hiss problem solved!
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Miikka Paatelainen


From:
Finland
Post Posted 14 Nov 2017 8:46 am     Reply with quote

The problem is probably in the tremolo. In Fenders that are imported to Europe the photocell is replaced with little circuit board full of very small smd-components and it is quite noisy. The reason for substitute is that the original photocell contains kadmium. Good news is that in the main circuit board there is a place for the original component and your amp tech can change it.
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Jim Sliff


From:
Lawndale California, USA
Post Posted 14 Nov 2017 9:06 pm     Reply with quote

Quote:
There have been reports of swapping power tubes to eliminate a hissing problem.

High gain tube amps may hiss when cranked as nature of the beast.


I would love to read the reality behind those reports. "Swapping" power tubes between sockets doe snot take any out of the circuit or eliminate any electronic function. Swapping "preamp" tubes - sometimes, especially if a "preamp" tube is swapped with a same-type tremolo oscillator (a non-audio tube) that is lower in hiss. Or a "quieter" tube is swapped into a lower-gain position - both being used in actual audio stages.

And high-gain amps hiss, yes - and the "gain" is created in the *multi-stage preamp* - NOT power amp.
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Paul Arntson


From:
Washington, USA
Post Posted 15 Nov 2017 8:10 am     Reply with quote

I got a whole batch of 12AT7s free one time. Every one of them had a pronounced hiss when used in the reverb driver of a twin. Oh well at least the price was right.
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Sigi Meissner


From:
Duebendorf, Switzerland
Post Posted 18 Nov 2017 2:58 pm     Hiss on new Twin Reverb Reply with quote

My amp tec changed one of the pream tubes. The hiss reduced drasticly. Thnx for your helpful comments
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