| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 2358.1 | see 2346.11 | LEDS::BURATI | Fender Bender | Mon Oct 21 1991 16:23 | 15 |
|
> Could I have broken one of the smaller tubes when I reseated it?
Maybe but you can easily check that. I doubt that that is your problem.
> Is the bias so out of whack that I'm burning up tubes?
I don't think you bias is a problem, although it could very well need
adjustment.
> Would an "off" bias cause the amp to be fine one moment and then hum
> like crazy the next?
no
|
| 2358.2 | | DNEAST::GREVE_STEVE | Greee Veee King | Mon Oct 21 1991 16:28 | 9 |
|
Well, I'm no yube guru, but isn't it proper to replace the phase
inverter tube every time the power tubes are replaced with newer more
powerful tubes???... Doesn't the vibrolux use 1/2 of a 12ax7 for the
vibrato... my vibrato is weaker than the mina signal too, always bugged
me a little...
Regards,
Steve
|
| 2358.3 | | BTOVT::BAGDY_M | | Mon Oct 21 1991 21:30 | 26 |
| 2358.4 | more info | RICKS::CALCAGNI | Musician's Friend - wife's enemy | Tue Oct 22 1991 12:43 | 13 |
| Very hot power tubes and loud humming are clear indications that the
power tubes are underbiased; in this situation, there's not enough
negative bias voltage on the grid, and the power tubes conduct more
current than they should. Normally, a simple rebias would fix this.
However, the symptoms you describe, where the problem went and came
back and some weird interaction with the vibrato circuit, suggest
something more serious; perhaps a loose connection in the bias circuit
or a major component failure as suggested in previous replies.
It's impossible to shoot this via notes; I suggest a trip to the amp
doctor.
/rick
|
| 2358.5 | ex | MRCSSE::WAIBLE | | Thu Nov 21 1991 15:10 | 18 |
| Brian:
YOu've probably already solved this by now but there are some good
techniciansl out there. I have had good look with R.M.I which is
adjacent to UNion music is Worcester. i just had a fender pro-reverb
rebuilt there. There is a whole team of guys and they work on
everything from tube to idigital. It sounds like a short to me; some
kind of interemittant and you might as well bring it to somebody that
can give yuou a 90 day warranty. They will also give you an estimate
befiore they go in to complete the job so that you know what your
looking at.
forgive me fro chatting in the notes file buit i think we jammed a
few years back in fact i think i subbed for you in you band for a
couple of giggs when you went on vacaation. I'll send you mail.
I'm still playing and glad to see you are too.
--Fred
|
| 2358.6 | 2 10s or 1 12? | SHOEBX::CONNER | | Thu Nov 19 1992 17:28 | 12 |
|
I have an old Fender Vibrolux that someone modified to use a single 12
in speaker. I have been considering restoring it back to the original
(2 10 in speakers) cause it's kind of a classic - black pre CBS -
anything old is worth more and more these days - except maybe software
specialists...
Can anyone comment on which speaker configuration sounds/performs better?
I have an JBL 12 in - should I restore it back to Fender speakers?
Paul
|
| 2358.7 | you can't afford to buy another! | ROYALT::BUSENBARK | | Thu Nov 19 1992 17:56 | 7 |
| I had a Vibrolux Reverb with a 12" EV once and found it to be a real
workhorse of an amp. I'd say it's worth keeping and restoring as these
amps are getting few and far between.
Rick
|
| 2358.8 | cool amp | MSDOA::BLAIR | Shut up and eat your notemeal | Fri Nov 20 1992 10:24 | 4 |
|
If it was me I'd order a pair of the '63 Vibroverb reissue speakers,
assuming that the Vibrolux and Vibroverb are close to same output
(40 watts).
|
| 2358.9 | yeah, cool amp | RICKS::CALCAGNI | Buckethead for president | Fri Nov 20 1992 11:22 | 9 |
| Or another idea; Kendricks sells it's own "black frame" speakers that
are supposed to be the bees knees when it comes to vintage Fender
restorations. It's the speaker he uses in his 4x10 Bassman copy.
Price from Kendricks is $75 apiece but they can be had for more like
$50 if you shop around.
If it were me, I'd definitely go back to the 2x10s in this amp.
/rick
|
| 2358.10 | | LEDS::ORSI | The Croco-Stimpy..HAPPY HAPPY!..JOY JOY! | Fri Nov 20 1992 12:41 | 11 |
|
When you put an 8 ohm 12" spkr in the Vibrolux, was there any
noticeable drop in output power?
Rick,
I was thinking about calling Kendricks about getting some spkrs
for my Blackface Pro Reverb. Any idea how much for 12" version,
and who else might carry vintage replacements?
Neal
|
| 2358.11 | but who else sell's 'em? | GOES11::G_HOUSE | Big cheese, MAKE me! | Fri Nov 20 1992 14:01 | 7 |
| re: Kendricks speakers
That's not a bad price at all for a custom speaker! I'd have expected
them to be more then that. Definitely sounds like a viable option to
me.
Greg
|
| 2358.12 | I need a memory like Brian Rost's | RICKS::CALCAGNI | Buckethead for president | Fri Nov 20 1992 14:48 | 10 |
| re .10
I was quoted $50 apiece for new Kendrick's 10" black-frames (in quantities
of two or more) by a guy in Minnesota, Tom (something)? He deals a lot of
vintage Fender amp parts. Neal, I think you've even mentioned doing business
with this guy yourself; his name and number are somewhere here in notes.
I think his price for the 12's was $100 (down from Kendrick's $125). I'll
have to check through my stuff at home this weekend for more details.
/rick
|