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Thunderbird Club

I wonder why.
I've always had the opposite running pre's right into the front end.

When you play through the B-15, do you use your pre with it, if so, how do you run it?
Absolutely not. The B-15 sounds great on its own. I have the pre only for when I have to use an amp I'm not familiar with or don't like. I really don't know why it sounds terrible running into the front. Maybe it's because when I need to use it it's with an amp I'm not familiar with, so I would have no idea how to set it to sound best with the pre, nor do I have time before a gig to play around with settings. So I just settle for "good enough" with said amp.
 
Yeah, mine was a POS, I've searched online but can't find any tube Univox bass amp like that, who knows? I have a Reverberocket, 18 watts with one 12", great guitar amp, it's got 6V6's instead of the hifi tubes they used on most of them (7591's?), it's stock too, I think it's about a '63.
1221s use this voltage doubler that creates an interesting compressing effect on a bass but not so much guitar…. almost makes you wanna play more staccato and percussive…..hard to pin point what it is….
upload_2022-9-24_20-23-7.jpeg
 
1221s use this voltage doubler that creates an interesting compressing effect on a bass but not so much guitar…. almost makes you wanna play more staccato and percussive…..hard to pin point what it is….
View attachment 4824286


That looks like a nice head. I've looked all over the place at Univox heads and combos with Google and nothing jogs my memory for the one I had. I bought it in 1968 and sold it in 1969. Course if I at least had a mental picture of it, it might be easier. When I first started coming to Lima I joined a band here that had a 100 watt Teisco tube guitar head with a big double 15" cab, I loved the sound of the head, it was just loud enough that it would break up slightly and sounded really good. The next time I came back he had gotten rid of it, I wanted the thing.
 
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1221s use this voltage doubler that creates an interesting compressing effect on a bass but not so much guitar…. almost makes you wanna play more staccato and percussive…..hard to pin point what it is….
View attachment 4824286
Jeez! It's the veeblefetzer of course.:smug:
 
1221s use this voltage doubler that creates an interesting compressing effect on a bass but not so much guitar…. almost makes you wanna play more staccato and percussive…..hard to pin point what it is….
View attachment 4824286


Where's that voltage doubler, for the output (plate?) section?
 
If anyone was ever in Houston, Tx. on a Wednesday night and wanted to let me check out their Thunderbird in a blues situation, I'd really dig it. I'll take you out for dinner, your choice of cuisine.

I promise not to beat on it and abuse it like I do my basses.

I may be glancing in the direction of Round Rock when I type this, @Miles_ONeal. :rolleyes:

If I'm at all likely to be down that way on a Wednesday evening (and not flying, which why would I?), I'll try to remember to bring two birds (no stone, no bush).
 
Just an FYI, the Fluke measures 3.2 ohms on the 215M cab. That makes sense as the amp was set for 200w at 4 ohms. Good to know if I ever use it with the MM as it has a switch for 4 or 8 ohms.

Perfect. Rule of thumb is that DCR for a speaker circuit is 80% of the nominal impedance. So a 4 ohm speaker (or cab) measures 3.2 ohms DCR, an 8 ohm measures 6.4, etc.
 
1221s use this voltage doubler that creates an interesting compressing effect on a bass but not so much guitar…. almost makes you wanna play more staccato and percussive…..hard to pin point what it is….
View attachment 4824286

Some voltage doublers didn't take everything into account. They couldn't meet current demand when slammed and the voltage would collapse - especially with lower frequencies. Is that what was happening here?
 
Absolutely not. The B-15 sounds great on its own. I have the pre only for when I have to use an amp I'm not familiar with or don't like. I really don't know why it sounds terrible running into the front. Maybe it's because when I need to use it it's with an amp I'm not familiar with, so I would have no idea how to set it to sound best with the pre, nor do I have time before a gig to play around with settings. So I just settle for "good enough" with said amp.

Understood.
 

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