it’s a ’59 fender tweed champ with 8″ stock jensen speaker. I’ve learned more than a few things from this amp. mostly about the tone. and it forces me to play more than before I got this small tweed amp.
I’m using 5y3 rectifier for the original setup along with 5v4g for more clean headroom. and watching that huge rectifier from the back side. 5v4g and Bendix 5y3 look beautiful at night.
5F1 breaks up early and it’s the character of this amp. 5v4g makes 5F1 sounds a bit like tweed deluxe. but, it’s still tweed champ of course. and, I recently noticed 5f1 with 5v4g is more vulnerable to 60hz hum. so, I came back to the stock 5y3
a close friend gave me his NOS or like new silver p12r speaker for my tweed deluxe 5d3 a few months ago. then I got me a P12N which I like for the last 15 years.
but, I couldn’t help myself to search the original p12r with the bell. I mean p12r from the same era with the same color.
I dropped by his place a couple of days ago. he showed me this p12r pulled out of his 5C3 a while ago. it was the present for me and my 5d3. I ordered a speaker cone looked like the original even before I knew he had this. and I like the black switchcraft 1/4 plug which I’ve been after.
did a simple job for a friend. he has some extra 50’s Jensen speakers and wanted to use them with this GT40 amp.
he told me GT40 has mono and stereo output mode. so, we decided to leave one of the 6.5″ speakers as it was. then put a long thread 1/4 jack on the other output.
the only place I found for the internal/external switch was the inside of the bass reflex vent on the back. the back panel itself is too thick to attach the switch.
didn’t know Jensen had Concert series with ceramic magnets. this PM-1002 sounds more like Jensen 10J11 than WGS Veteran ceramic to me. even I believed it was an alnico speaker when I grabbed this off ebay for $69 plus shipping. then googled what Syntox-6 was after a week playing this in my 5F1 project. a bit disappointed while figuring out what the magnet was. but still happy with this NOS Jensen with the original box. and it is way louder than Jensen 10J11 alnico speaker as I expected.
I’ve tried Mullard and a few different 12ax7 tubes with it. and going to stick with GE black plate 5751 for a while.
my ’94 yz10 runner got a new shell with some decals today.
now it runs with
HD universal drives
Yokomo Aluminum motor mount
Team Suzuki F/R hubs and hub carriers
’93 WCS steering
[update from July 2nd, 2015]
found the MX4 wheel hubs for YZ10. and more MX4 wheels for this setup too.
pargu is working on the wheel hubs. you guys can use them pretty soon.
found this nice and old datasheet probably was a part of the Jensen brochure. and it’s great to see the exact output of the 50’s Jensen speakers. P12R was the stock speaker for tweed deluxe. and now I can see why it came with tweed deluxe. btw, P12R and P12Q share the same bell cover. and you cannot install P12N and P12P with the bell in tweed deluxe because of the size.
P12R = 12watt
P12N = 18watt
and, this thread in the same forum says
P12Q = 14watt
P12P = 16watt
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This post would be a help. but it seems impossible to get them unless you guys push MIP to make them again.
it’s the basic info for Yokomo CVD bones
’94 YZ10 front CVD bone 84mm
’94 YZ10 rear CVD bone 79mm
MX4 rear CVD bone 79mm
Kysho RB5/RB6 70mm CVD bones work for 870C F/R
MX4 rear bone works with ’94 YZ10 rear. and, Works F/R
’94 YZ10 rear bone works with Works F/R. and, for 870C front wide setup
Bj4 front bone doesn’t work for Yokomo diff cups
’94 YZ10 front
from the top, MX4 Rear / ’94 YZ10 Rear / Jconcpets BJ4 front.
the length are identical to each other. but the head pins are not. I’ve tried more CVD bones from AE and Losi. and all the US brand CVD bones have bigger head pins which don’t fit Yokomo diff cups
While the length is identical, Bj4 CVD bone don’t work for Yokomo diff cups
’94 yz10 cvd bones go deep inside of the diff
MX4 bones have longer head pins. it’s fine except for 870C