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FDP Forum / Fender Amps: 1985 - Current / 68 Custom Twin Reverb Hiss

electrickarma

United States

Apr 11th, 2019 08:49 PM   Edit   Profile  

Hi everybody! This is my first post... it is great to be part of the forum!

I recently bought a brand new 68 Custom Twin Reverb and, although I love the tone, it has a very bad idle hiss problem. This hiss is not your average tube amp idle hiss... it's rather loud and it makes it impossible to play quieter song parts... I can only imagine that it would be a nuisance in the recording studio or when miked in larger stage.

I've been researching and apparently this is a known issue with the new Silverface Twin and Deluxe Reverb amps, but I wanted to ask you guys if this is as common as it seems.

So, I guess my question is: Do all new Silverface Twin Reverb amps do this even when they are brand new? Has anyone bought one that does not do it? Are they prone to having this hiss after sometime even if they don't do it at first?

Since I bought my amp in a well known guitar store chain, I have the chance to return it and get a new one. I am on the fence now between getting another silverface and hoping that the problem was not the model but the specific amp I got, or just spending a little bit more and getting a 65 reissue, since every single one of the blackface amps I've tried had no hiss at all compared to the silverface ones.

Thanks!

budg
Contributing Member
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ohio

Home of the Goodyear blimp
Apr 12th, 2019 09:48 AM   Edit   Profile  

I can’t speak of the twin, but I have a 68 Princeton Custom that is quiet as a church mouse. I have heard others complain about idle hiss as well.

Maybe take it back and exchange it for another 68 twin custom to see if it’s better. If not maybe move on to something else.

electrickarma

United States

Apr 12th, 2019 11:09 AM   Edit   Profile  

Thanks for the reply! I have read somewhere else that the Princeton is indeed the only one in that Custom 68 line that does not hiss. I am leanin towards the 65 more and more...

pcalu

usa Thumb area Mi

Apr 12th, 2019 01:24 PM   Edit   Profile  

That's my vote too (exchange it... usually what doing that are the caps )

Expect some hiss though.

A) It's a TUBE amp (over the years I've read some pretty lame complaints about hiss, IMO most of those type of comments have me wondering if the commentator knows the dirt pedal they are using could be doing it too. etc

B) It's a Custom 68! (Great amp!) All of them have that Tweed type tone stack on the left channel that pushes the mids.

Mids are what overdrives the preamp stage (side note.. experiment with rolling up the mids and adjusting the Treb and Base accordingly. Listen to how punchy the amp will get.

C) The Negative Feedback is set lower than a normal 65 RI (it's for the left channel, it helps with the tone when the amp overdrives ) This also can lead to some his.


After you exchange it, If you get another and still have hiss and still want to keep it. Install a 12ay7 in V1 and V2 99% of the time that will do away with the hiss (another side note 12ay7s are what Fender put in their originals tweeds and are a quieter tube, yet still great tonality ... and work well with Twins... Only V1 and V2 ... leave the rest)

(This message was last edited by pcalu at 03:31 PM, Apr 12th, 2019)

Doc Sarvis
Contributing Member
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USA/Salt Lake City

Tuned Strings and Tight Lines
Apr 12th, 2019 04:05 PM   Edit   Profile  

pcalu said: "Install a 12ay7 in V1 and V2"

This is good advice. Buy a good vintage 12ay7 or even a 5751 will be quieter and I don't think you will miss the gain.

budg
Contributing Member
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ohio

Home of the Goodyear blimp
Apr 12th, 2019 05:10 PM   Edit   Profile  

I’ve been using JJs in my Fenders and they are pretty quiet compared to the other tubes I’ve used. The 12ay7 is a good idea.

Peegoo
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Just beyond Mars

there's a world of fools
Apr 12th, 2019 11:28 PM   Edit   Profile  

Welcome to the forum!

If it turns out that the other amps you test are doing the hiss, any decent tech can trace the signal through the circuit and determine where the hiss is originating.

It may be tubes, it may be noisy resistors, it may be something simple like lead dress.

Please keep us posted!

electrickarma

United States

Apr 15th, 2019 08:44 AM   Edit   Profile  

Hi everyone.

Thanks for the replies! Last night during band practice the amp's reverb stopped working, so I finally returned it. Instead, I bought a used 65 TRRI for $850 that sounds way better than the Silverface and does not have any hiss or hum of any kind.

Everything worked out!

budg
Contributing Member
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ohio

Home of the Goodyear blimp
Apr 16th, 2019 02:10 PM   Edit   Profile  

Thats the best solution electrickarma. Why keep something that you arent happy with. The 65 reissues are great amps imo. I have a 65 drri. I also have a 68 princeton custom , but I am happy with it and it doesnt have the issues with hiss the other ones do.

Rock on and enjoy that 65 trri.

FDP Forum / Fender Amps: 1985 - Current / 68 Custom Twin Reverb Hiss




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