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Topic: Fender Roach |
Brian LeBlanc
From:
Falls Church, Virginia, USA
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Posted 10 Nov 2008 9:37 am |
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i hate to show my ignorance
(but I'm pretty good at it)
- theres no way (feasible) to replace the tremo roach with a REAL Tremolo like the Princeton & V-Champ?
_________________
'Frenchy' LeBlanc...
ShoBud & Twins |
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Jerry Erickson
From:
Atlanta,IL 61723
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John Billings
From:
Ohio, USA
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Posted 10 Nov 2008 11:46 am
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| I think you'd have to add more tubes. There was somebody advertising an add-on box with tubes that you fastened inside your amp's cab. The ads were in Vintage Guitar. I think it was based on the Fender Super's circuit, which is the best you're ever gonna hear. I bought a '63 'cuz I had to have that sound! |
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Donny Hinson
From:
Glen Burnie, Md. U.S.A.
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Posted 11 Nov 2008 9:15 am
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| The new circuit can be rewired to sound and work like the older one. It's simply a matter of changing some component values and adding a few parts. Moreover, it's how the oscillator gets tied into the circuitry that gives it a different sound. |
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Dave Mudgett
From:
Central Pennsylvania and Gallatin, Tennessee
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Posted 11 Nov 2008 8:30 pm
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As Donny says, the number of preamp tubes on the most classic white/brown Fender reverb/trem amps are the same as the comparable blackface/silverface amps - 6.
My favorite Fender guitar amp, bar none, is the brown-tolex, brown-panel 6G16 Vibroverb with 2-10" speakers. All 6 preamp tubes are 12AX7/7025, while the comparable blackface/silverface Vibrolux Reverb has 4-12AX7/7025 tubes and 2-12AT7 tubes (reverb driver and phase inverter).
The Vibroverb, white Tremolux, BF/SF Princeton series, and Vibro-Champ get their tremelo by modulating the bias voltage. The GOOD way, to my tastes. [Still love my BF Vibrolux Reverb, but I wish they never redesigned the tremelo.]
The bad news is that a brown Vibroverb is beaucoups bucks - and I mean beaucoups.  And I wouldn't think of modding a great old Vibrolux Reverb - they have their own thing that is also great.
Of course, one could build a clone - the schematic is here: http://schematicheaven.com/fenderamps/vibroverb_6g16_schem.pdf - or get one of the reissues that Fender made in the 90s. Yeah, PC board construction, but still pretty durned good amps. |
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Dave Sharp
From:
Bloomington, Indiana
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Posted 13 Nov 2008 4:09 am
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Here's a link to a Hoffman Amps layout of an AB763 type Fender circuit with a bias-vary tremolo:
http://www.el34world.com/Hoffman/images/Ab763.gif
I haven't tried this mod and I don't know how it lays out on a Fender board, but it looks fairly simple. |
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