Newsgroups: alt.guitar.amps,rec.audio.tubes
Subject: Re: resistors - carbon vs. metal
Date: Wed, 01 May 1996 09:49:24 -0500
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Xref: geraldo.cc.utexas.edu alt.guitar.amps:14103 rec.audio.tubes:9176
Robert Fries wrote:
>
> James Lane
>
> >mr teleologist,
>
> >what speaker, tube, bias combination would you recommend for the deluxe
> >reissue? They come stock with jensen 12" and fender tubes.
>
> >Thanks in advance for the info.
>
> >-James
> Didn't see the original post from Jim - Bob is correct about the Eminence
speaker, tubes etc. The Eminence 12" speaker is a little weird as it has
the deep cone angle & small dust cover like the old P12 alnico Jensens, but
with a BIG ceramic magnet. IMO it sounds decent in the pseudo tweeds, but
lacks bass response & punch while 'razor-blading' your ears in the BF
circuits. The C12 series Jensens have a shallower cone angle & a bigger
dust cap which produce more bottom and a less tightly focused top end.
Although not commonly shipped in the Deluxe Reverb I like(and have) an
original cone C12Q. This version has a larger magnet, a 1/4" bigger voice
coil, and IMO handles modern 'cranked up' power levels better than the
usual C12R. Tremolux has posted that some guys are using P12Ns or Ps in
Deluxe Reverbs & loving the results - Haven't tried that....yet!
The amps I AB'd were my own '66(bought new in '66!) & a 1st year
reissue(93?) using the C12Q in my amp & also a JBL D120F in a repro Deluxe
extension cab. As I recall tubes at the time were an Amperex or Mullard
GZ34/5AR4, Sylvania 6V6GTAs, & Phillips/Sylvania 12AT7s & 12AX7s. The same
set of tubes were swapped in the same positions from amp to amp. My amp's
'sweet spot' happens with the tubes biased between 24 & 25ma per tube with
about 417-418 B+(about 413 on the plates). All voltages were consistent
bewteen the 2 amps. Each amp was recorded to digital 3 ways(direct plus 2
mikes) with clean & distorted sounds from different guitars & 2 different
players(no EQ tweeking on the board BUT settings on the amps were different
- pot tapers are different so this isn't a pure scientific test...we were
curious!). The tapes were AB'd thru headphones, nearfield monitors, &
upgraded JBL 4311Bs and it was difficult(but possible) to tell them apart!
The oldie had a little more compression & a slightly mellower top end. With
a RIC-12 clean using the D120F, higher frequency harmonics seemed to bloom
better on the oldie but were definately present with the reissue. (BTW -
Both amps sounded like ____ using the reissue speaker!)
A friend has a reissue Twin Reverb which received a pair of JBL E120s &
Sylvania STR 415s. For the very few live gigs I play I usually rent a
favorite BF Twin Reverb & these 2 amps compare fairly well despite differnt
speakers etc.
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