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Fender Studio Bass Club!

#321
Passinwind said:
Super Twins are/were combo amps with an open back. No bueno for bass.
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yes, open back cabs for bass are definitely not good. But, the Super Twin is basically the same circuit as the Studio Bass with the exception of the Distortion control (truly egregiously bad) and the rotary EQ section points are a bit more guitar oriented vs the ones used for the Studio Bass. Still, folks like john10_k have successfully converted the Super Twin amp section to bass use.

I don't know the Mojotone headcase model number, but the one that fits the Studio Bass/Super Twin amp chassis has the outside dimension of 26" wide, with an inside width of 24 5/8".

fits like a charm.
 
#322
Jeff Bonny said:
I'm trying to research the Studio Bass I just got and there really isn't a lot of useful info out there.
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That is just like this amp.. hardly any info out there and what is out there is a lot of hearsay!
I did get the skivvey on how many were actually made.. a total of 60.

Rumble2.jpg
 
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#323
99Z3 said:
That is just like this amp.. hardly any info out there and what is out there is a lot of hearsay!
I did get the skivvey on how many were actually made.. a total of 60.

View attachment 929549
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that Rumble Bass is a beauty for sure. A lot more Studio Bass amps were made than that because they were full production items for a few years. But yours is a Fender CS deal, so it makes sense they only made 60. In fact I'm kind of surprised they made that many.
 
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#324
I am surprised that they even had a record of how many they made. He had to dig through the archives to find it!
pfschim said:
that Rumble Bass is a beauty for sure. A lot more Studio Bass amps were made than that because they were full production items for a few years. But yours is a Fender CS deal, so it makes sense they only made 60. In fact I'm kind of surprised they made that many.
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#325
pfschim said:
yes, open back cabs for bass are definitely not good. But, the Super Twin is basically the same circuit as the Studio Bass with the exception of the Distortion control (truly egregiously bad) and the rotary EQ section points are a bit more guitar oriented vs the ones used for the Studio Bass. Still, folks like john10_k have successfully converted the Super Twin amp section to bass use.
Click to expand...

Roger that, just saying that an actual Super Twin combo cabinet is not what you'd want.
Yel_wink.gif
 
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#328
Zepedro said:
HI, here is mine :)
http:// [B]Invalid Link Removed[/B] [URL='http://www.aht.li/2981518/Studio_Bass.jpg'] [ATTACH=full]2553103[/ATTACH]
I never had a foot switch for this amp, could someone tell me where could I find one, it doesn't matter if it's not the original one...[/QUOTE]
cool, looks well "loved" ;)
the speaker looks like it might have lost its dust cap ? My Studio Bass is just the amp re-housed in a Mojotone head case, but I have seen (and played) enough of the original format combo's to recall that the speaker had a dust cap.

well, enjoy the amp, they are great all tube tone machines. :thumbsup:
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#330
I'm sure it does, but you might consider replacing the missing dust cap. A dust cap will help keep crud out of the voice coil gap. The dust cap also helps with dispersion and cone rigidity (which helps the speaker deliver the frequencies it was designed to deliver).

great combo
enjoy/¡Disfrútalo! :thumbsup:
 
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#331
Here's a question for you guys. Can you change the output transformer in one of these to allow for a more typical 4 or 8 ohm selector switch? Since these are close brothers to Super Twins, can you simply use a Super Twin OT and add the selector switch?

I haven't read the entire thread yet so apologies if this was addressed earlier. I have found one of these for a good price and I was curious.
 
#332
Studio Bass is 8 Ohm and Super Twin is 4 Ohm. Neither have multiple taps on the output transformer. I think they are the same size though, so I think Fender made a bad choice back then by not making 1 TX with multiple output tabs for both amps.
There's probably a Hammond (1650 series) transformer that would work, but I haven't tried one myself.
Anyone know the primary impedance of the original transformers?

Mark
 
#333
Thanks Mark. That is odd. As I was reading more thru the thread I saw that a few were running a 4 ohm load seemingly without issue so perhaps I wouldn't have to worry about it. Still would be a better option to have an ot with both and then add the switch. Can always call Hammond or others and ask the question I suppose.
 
#334
Hey guys,
I am thinking of buying one of these but at the same time am really gased by the new 100T and it's extra drive channel. Tell me: While I'm sure it can't be as hard as the 100T / 300 - can it produce a decent drive? I'm not into the fuzzy stuff but more like that particular drive channel. Any chance it can kind of go in that direction?
 
#337
Hmm, that's what I was expecting. Thanks a lot for your thoughts!
There is probably a chance when using a booster to get a hotter signal into the preamp but I'm still on the fence because that offer I have is not really a bargain and that 100T has so many convincing features.

Has anyone compared the basic sound of the two amps in question?
 
#340
pfschim said:
There is a Fender history that covers the Ed Jahns period at Fender (before Paul Rivera, and overlapping with Rivera). Many of the designs that Rivera is credited with are actually Ed Jahns designs, at least up to around 1982 (?)
I think Jahns was also the designer behind the PS400 and 300 amps as well.
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pfschim said:
There is a Fender history that covers the Ed Jahns period at Fender (before Paul Rivera, and overlapping with Rivera). Many of the designs that Rivera is credited with are actually Ed Jahns designs, at least up to around 1982 (?)
I think Jahns was also the designer behind the PS400 and 300 amps as well.
Click to expand...

I rebuilt a PS400 once a while back. Certainly a hair raising experience. A quality industrial Ed Jahns creation. One of the best bass/guitar rigs ever designed.
 

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