It is currently Mon Mar 16, 2020 4:51 pm

All times are UTC - 7 hours



Post new topic Reply to topic  [ 16 posts ]  Go to page 1, 2  Next
Go to page 1, 2  Next
Author Message
Post subject: 1972 Silverface Twin Reverb
Posted: Sat Oct 16, 2010 2:42 pm
Offline
Hobbyist
Hobbyist

Joined: Sat Oct 16, 2010 2:24 pm
Posts: 4
Hello,

I recently started playing guitar and purchased a 1972 Twin Reverb.

I would appreciate some assistance with the Master Volume control.
The unit has a master volume. (Not one of the push-pull models)

Can someone please explain the proper way to use this control?

Any general assistance with the amp would also be appreciated (best settings etc.)

I am also looking for a users guide from that era. (1972)

Many thanks

Bill


Top
Profile
Fender Play Winter Sale 2020
Post subject:
Posted: Sat Oct 16, 2010 7:00 pm
Offline
Hobbyist
Hobbyist
User avatar

Joined: Mon Feb 11, 2008 3:37 pm
Posts: 81
Great amp, take care of it and it will last a lifetime. I had my '75 for almost 35 years, sold it last year about this time. Only because I was having trouble hauling it around. I never had any problems with it, did 1000's of gigs, was easy on tubes, I still have the original RCA 6L6's and they are being saved for a different amp. They still test good and have about 15 years of daily use on them.

Any way to your question.

The Master is just a global volume control. It affects both channels volume but it does feed back part of the signal from the Vibrato channel to it's preamp for some distortion. I usually had my Master pushed in and at 10 and adjusted the channel volumes where I wanted. This gives you the best clean option, which I used most the time. The Push Pull also added a little presence when pulled out. Turning down the Master to about 3 or 4 and turning the Vibrato channel volume to about 10 you can get some mild distortion. The Push Pull in this way changed the OD, so you had 2 types. The non-Push Pull only had one option (Sorry). The Manual suggested to put the Channel Volume at 10 and do the same with the tone controls, yea it's not a over the top Marshall OD but with HB's and a ES 335 I did a lot of great stuff that way. Another thing that will help you get more OD is replace the Driver Tube (Phase Inverter) to a 12AX7, it's the one next to the 6L6's.

You can also daisy chain your channels and use the normal channel as a FX loop with some good results. I did this all the time, guitar straight into the amp, patch to my FX and into the Normal channel to adjust the FX volume and tone. Try it.

Hope this helps.


Top
Profile
Post subject:
Posted: Sat Oct 16, 2010 8:03 pm
Offline
Professional Musician
Professional Musician

Joined: Fri Jun 26, 2009 6:53 pm
Posts: 2252
Location: Harvard IL
Hi there Bill, and welcome to the forum ! That is a nice amp. I think you'll find that most folks turn the master full-up and use the other controls to achieve the tones that are desired. Some amps have a pre amp section that will distort the guitar signal, then the idea would be to set-up a pre amp tone and then adjust the overall volume(power amp section) with the master volume control. But the Twin Reverb pre amp was designed to give a clean production of the guitar signal. So trying to manipulate that signal by raising or lowering the power section can result in somewhat strangulated sounds. Some amps will also distort the power section, when the master volume is turned up. But here again the Twin Reverb was designed to produce a clean output to the speakers. Now if you put a distortion pedal in front of the pre amp, the master volume may be more effective. As far as settings, I usually start with all tone controls on"5" and spend some quality time with the amp and guitar(don't forget about the guitar's controls), to find what the amp, guitar, and I like. You'll probably find that turning a control, a small amount can give some pretty neat results. Good Luck & Good Pickin' ! Art

_________________
None of Us are free, if One of Us is chained !


Top
Profile
Post subject:
Posted: Sat Oct 16, 2010 8:10 pm
Offline
Hobbyist
Hobbyist

Joined: Sat Oct 16, 2010 2:24 pm
Posts: 4
Thank you for the information Johnny, most appreciated...

As mentioned, I am kinda new at this...can you please explain the daisy chain procedure with more detail?

Bill


Top
Profile
Post subject:
Posted: Mon Oct 18, 2010 3:37 pm
Offline
Hobbyist
Hobbyist
User avatar

Joined: Mon Feb 11, 2008 3:37 pm
Posts: 81
jellyman5264 wrote:
Thank you for the information Johnny, most appreciated...

As mentioned, I am kinda new at this...can you please explain the daisy chain procedure with more detail?

Bill


Sure.

Plug your guitar into the #1 jack of one of the 2 channels, then take a second cable and plug it into the #2 jack of the same channel and go into the other channel, I usually go into the #1 jack, it should be more gain than #2 jack. You will get a dry signal to that channel so if you want you can add your FX in this loop and adjust the volume and tone. You can go from either channel doing this. You can also daisy chain into another amp if you like.

Thanks for asking.

_________________
My goal in life was to never be famous, just rich, so far I got the first part right.


Top
Profile
Post subject:
Posted: Mon Oct 18, 2010 4:56 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26417
Location: Tombstone Territory
The channels are out of phase with one another.

Arjay

_________________
"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


Top
Profile
Post subject:
Posted: Mon Oct 18, 2010 7:02 pm
Offline
Hobbyist
Hobbyist
User avatar

Joined: Mon Feb 11, 2008 3:37 pm
Posts: 81
Retroverbial wrote:
The channels are out of phase with one another.

Arjay



Not that it matters because all your doing is bouncing the signal from one input jack to another in parallel, it doesn't go through one channel into the next, like in a series circuit.

_________________
My goal in life was to never be famous, just rich, so far I got the first part right.


Top
Profile
Post subject:
Posted: Mon Oct 18, 2010 11:14 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26417
Location: Tombstone Territory
Sure, Hoss. Whatever you say.

And just what do you think occurs at the front of the phase inverter stage when those two out-of-phase preamp signals are summed together?

Arjay

_________________
"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


Top
Profile
Post subject:
Posted: Tue Oct 19, 2010 3:57 pm
Offline
Hobbyist
Hobbyist
User avatar

Joined: Mon Feb 11, 2008 3:37 pm
Posts: 81
Been trying to make some common sence of things and dispell some false myths, and share my own experiences, you keep putting me down post after post.

Dude you think your the final word on everything. F---- You
and good bye.

Forever.

_________________
My goal in life was to never be famous, just rich, so far I got the first part right.


Top
Profile
Post subject:
Posted: Tue Oct 19, 2010 4:19 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26417
Location: Tombstone Territory
Since you've declined to answer my question -- which is of vital interest to the OP -- due to issues of ego and/or lack of knowledge, I shall do so in your stead.

When two equivalent but out-of-phase audio signals are summed together within the phase inverter stage, the effects of such a mismatch are loss of frequency response at both ends of the audible spectrum and an apparent loss of gain overall. This condition is akin to mis-wiring a pair of speakers in an amp or cabinet. No harm will occur but the tone will be less-than-pleasing to the ear.

You may argue with me, you may argue with your wife, you may even argue with God. But you cannot argue with the laws of physics.

Bon voyage

Arjay

_________________
"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


Top
Profile
Post subject:
Posted: Tue Oct 19, 2010 5:34 pm
Offline
Professional Musician
Professional Musician

Joined: Fri Jun 26, 2009 6:53 pm
Posts: 2252
Location: Harvard IL
I don't know, Arjay. Always subscribed to the same "out of phase" theory as you. I was hoping Johnny would enlighten me as to a mistaken observation and belief. In the past year and a half, I've probably learned more about amp theory, than I learned in 20yrs. Had quite a few of my opinions and myths exposed to the science and math, that's involved. Man ! What a learning process ! Johnny, IMO the more points of view and experience we have in this forum, the better off, we'll all be. I have taken things, said here, in a personal way. I'm just saying that none of us are immune ! I remember Supro making a few posts, and then saying he was putting on his flame-proof suit. Maybe I should get the name of his tailor. Art

_________________
None of Us are free, if One of Us is chained !


Top
Profile
Post subject:
Posted: Tue Oct 19, 2010 6:15 pm
Offline
Hobbyist
Hobbyist

Joined: Sat Oct 16, 2010 2:24 pm
Posts: 4
I would like to thank you all for your input.

So if I got this straight...

I plug my guitar into channel 1 (vibrato) and then take a short cable from channel 2 (vibrato) and plug that short cable into channel 1 (normal) [with / without] a pedal in between for some sort of sound effect. (could someone please elaborate what the sound will be?)

Please understand…. this is a new and rather expensive amp (to me) and I would feel like a fool if I fried it in the first 2 months…

I trust that you understand

Many thanks

Bill


Top
Profile
Post subject:
Posted: Tue Oct 19, 2010 6:58 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26417
Location: Tombstone Territory
jellyman5264 wrote:
Please understand…. this is a new and rather expensive amp (to me) and I would feel like a fool if I fried it in the first 2 months…


To iterate:

"When two equivalent but out-of-phase audio signals are summed together within the phase inverter stage, the effects of such a mismatch are loss of frequency response at both ends of the audible spectrum and an apparent loss of gain overall. This condition is akin to mis-wiring a pair of speakers in an amp or cabinet. No harm will occur but the tone will be less-than-pleasing to the ear."

(emphasis added)

To do this correctly, I recommend an A/B/Y switch in front of the amp that has phase-reversal capability on one of the outputs. The Radial Tonebone Big Shot is one such device (there are others as well).

This phenomenon is not a factor in Fender's non-reverb dual-channel vintage-type amps -- the preamp phase reversal condition occurs within the reverb driver transformer.

HTH

Arjay

_________________
"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


Top
Profile
Post subject:
Posted: Tue Oct 19, 2010 7:11 pm
Offline
Professional Musician
Professional Musician

Joined: Fri Jun 26, 2009 6:53 pm
Posts: 2252
Location: Harvard IL
Yeah Bill, that's the method. Just to clarify the words; the channels are Normal and Vibrato. Each channel has ; input#1 and input#2. This might help with any further discussion, I'm easily confused. As far as the sound goes, you'll have to experiment to see if you like it There is no way that you can harm the amp by jumpering one channel with another, unless you're using a coat hanger between them.(guitar cable only) In all the years I've been around these Fenders, it never occurred to me to insert an effect between the channels. Live and Learn ! Art

_________________
None of Us are free, if One of Us is chained !


Top
Profile
Post subject:
Posted: Tue Oct 19, 2010 7:42 pm
Offline
Professional Musician
Professional Musician

Joined: Fri Jun 26, 2009 6:53 pm
Posts: 2252
Location: Harvard IL
Didn't see Arjay's post, until I posted. Gotta type faster ! Yeah that device would be real cool. But in the meantime , you can still experiment ! In-phase or out of phase, balanced or unbalanced power tubes, out of spec components, mis-matched speakers can all add up to a person's signature sound. I think it was David Gilmore's Gibson that was mistakenly wired, so a pick-up combination was out of phase, many years ago. Now that wiring scheme is a common practice. Art

_________________
None of Us are free, if One of Us is chained !


Top
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 16 posts ]  Go to page 1, 2  Next
Go to page 1, 2  Next

All times are UTC - 7 hours

Fender Play Winter Sale 2020

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to: