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Post subject: Twin reverb Tubes
Posted: Sun Sep 27, 2009 5:08 am
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Hey guys, Recently i Bought a twin reverb thats about 10-12 years old and its made in the USA (I dont know whether they're still USA made..)

Its been barely used and its been sat in somebodys bedroom all its life so ive been told and im wondering whether i should retube it.

It still has the original GT tubes i think. But it doesent seem that loud, i have a hot rod deville and thats loud on 2/2.5 the twins loud on about 4/5.

Further more can someone tell me what all those preamp tubes are for? there are 6 of them in there which does what?

and are there any tricks and tips you guys can offer me on the twin? Its quite easy to find stuff about the devilles/deluxe's since they're fairly common.

Thanks guys.

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Posted: Thu Oct 01, 2009 2:27 am
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any word on this fellas?

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Posted: Thu Oct 01, 2009 12:59 pm
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Big The Cat wrote:
any word on this fellas?


The Twin uses audio taper volume pots and the HRD uses a linear taper volume pot. Most of the HRD amps volume is spent before it hits 5. The Twins volume increase is more natural and gradual. The linear taper pots are more of an audio illusion or gimmick in the HRD amps to make you think the HRD amps are louder than they really are.

60 watts is 60 watts. Remember a 100 watt amp is not twice as loud as as a 50 watt amp. It's not 10 times louder than a 10 watt amp either.

Don't g by what the volume knob says. It's only a reference point. The numbers have nothing to do with how loud an amp actually is.


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Posted: Thu Oct 01, 2009 3:19 pm
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Originally posted by Big the Cat
Quote:
Hey guys, Recently i Bought a twin reverb thats about 10-12 years old and its made in the USA (I dont know whether they're still USA made..)

Its been barely used and its been sat in somebodys bedroom all its life so ive been told and im wondering whether i should retube it.

It still has the original GT tubes i think. But it doesent seem that loud, i have a hot rod deville and thats loud on 2/2.5 the twins loud on about 4/5.

Further more can someone tell me what all those preamp tubes are for? there are 6 of them in there which does what?

and are there any tricks and tips you guys can offer me on the twin? Its quite easy to find stuff about the devilles/deluxe's since they're fairly common.

Thanks guys.


Stolen from the interweb ^^
Looking at the amp from the REAR, numbering the sockets from RIGHT to LEFT (which is the way the signal flows inside the amplifier), here's what each tube does: NORMAL channel preamp/tone stack(1). VIBRATO channel preamp/tone stack(2) REVERB drive tube (feeds signal to the spring tank)(3) REVERB recovery and mixing tube(4) TREMOLO oscillator(5) Phase inverter(6)

As for good tubes, I have nothing but good things to say about eurotubes.com. Here's a link:
https://ssl.eurotubes.com/cart/index.ph ... gory_id=38

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Posted: Thu Oct 01, 2009 5:09 pm
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+1 on Eurotubes. Bob provides a great product JJ's, and great service. He only sells JJ's.


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Posted: Fri Oct 02, 2009 12:21 pm
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Here's my two cents, when I purchased my twin it was 11 years old and the first thing I did was to reseat all the tubes. There were a few tubes that were almost halfway out and after reseating the tubes I notices a significant difference in volume. Second thing I did was I removed the chasis from the amp and cleaned all the pots and contacts with radio shacks tv tuner pot cleaner. Once again I noticed a difference once I reassembled it and tried it out. Last thing I did was to rebiase the tubes. Wow, this made the biggest difference of all. The tubes were biased on the cool side and after adjusting to around 70% 0f max dissipation this amp really took off. If you're not sure on how to perform some of these steps I would suggest you take it to a qualified amp tech and have him perform a tune up on your amp. He would be able to tell you if you need new tubes or just a good cleaning and rebiasing. Hope this helps.


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Posted: Fri Oct 02, 2009 2:50 pm
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Capo wrote:
TREMOLO oscillator(5) Phase inverter(6)


Tremolo oscillator? theres no tremolo on this amp? Further more what does the phase inverter do?

Also the twin sounds really really trebly on the cleans, especially when putting overdrive/distortion pedals threw it! is it normally like this?

Also my twin has an XLR out but no IN. do they normally have this or is this a mod? i know my amp used to belong to an electrician so he might have messed with it.

Also thanks fender 323 i think i'll get it looked at =)

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The past weeks have been going by so fast
It's all the same, the bright sky and shining sun
I have a feeling it's gonna be a fun day"


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Posted: Fri Oct 02, 2009 3:28 pm
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The phase inverter (PI) is part of the power amp in a push-pull type amp. The signal is supplied to the PI from the preamp. The power amp in a push-pull type amp is divided into two sections, each section amplifying part of the signal. The two parts of the signal are summed back together in the output transformer.

It is the job of the phase inverter to split the preamp signal into two halves, each half a mirror image of the other. The signal is an ac signal with a positive and a negative part, one half of the signal from the PI is the positive part and the other half is the negative part. These halves are sent to the power tubes, one to each section.

Oh and tremolo and vibrato. Tremolo is the effect where the volume of the amp increases and decreases at a certain rate. Vibrato is the effect when the pitch is raised and lowered at a certain rate. It's confusing as hell because when Leo incorporated these effects into the amps he called tremolo vibrato and vibrato tremolo. So for sake of consistency lets call it the vibrato oscillator.

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Posted: Fri Oct 02, 2009 3:44 pm
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Capo wrote:
The phase inverter (PI) is part of the power amp in a push-pull type amp. The signal is supplied to the PI from the preamp. The power amp in a push-pull type amp is divided into two sections, each section amplifying part of the signal. The two parts of the signal are summed back together in the output transformer.

It is the job of the phase inverter to split the preamp signal into two halves, each half a mirror image of the other. The signal is an ac signal with a positive and a negative part, one half of the signal from the PI is the positive part and the other half is the negative part. These halves are sent to the power tubes, one to each section.

Oh and tremolo and vibrato. Tremolo is the effect where the volume of the amp increases and decreases at a certain rate. Vibrato is the effect when the pitch is raised and lowered at a certain rate. It's confusing as hell because when Leo incorporated these effects into the amps he called tremolo vibrato and vibrato tremolo. So for sake of consistency lets call it the vibrato oscillator.


Thanks you've cleared up quite a bit!

but does anyone else find their twin a bit trebly? and have an XLR out on the back?

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"Oh, it's a windy and sunny day
And I can hear the faint sound of distant waves
The past weeks have been going by so fast
It's all the same, the bright sky and shining sun
I have a feeling it's gonna be a fun day"


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Posted: Fri Oct 02, 2009 6:20 pm
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Twins have always and will be very bright amps. I'm not sure if there's anyone who's played a twin and thought it wasn't insanely bright, it's something you get used to over time >_> As for the XLR jack, I do not believe it comes stock on the 65 reissue. It does come stock on the Fender Twin Amp though, but my guess is it's a mod.

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