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Post by JFrankParnell on Feb 5, 2011 19:25:21 GMT -5
...oh, and sumgai was there, too  Sumgai got my '73 Bassman 100 working like new again. A set of tubes and some tinkering in the right places cured it of the scratchy disease and the intermitant 'no fun' problem. I'm really digging the 'normal' channel which had been disnonfunctional for umpteen years. It has a much smoother sound than the 'bass' channel, for guitar anyway. Now, I'm'a make an a/b/y switch to choose between the two and to run both together, as there are usable tones all the way 'round. (btw, if anyone has a link to the definative passive a/b/y switch, I'd appreciate it). Anyway, thanks to sumgai for the fix up and a nice afternoon of guitar nuttery! |
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Post by gumbo on Feb 6, 2011 6:48:49 GMT -5
....I'm REALLY impressed that he managed to do all of that inside the paper bag...  |
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Post by ashcatlt on Feb 6, 2011 11:51:39 GMT -5
#2 from this thread looks pretty good. If you can live without the LEDs then you can eliminate the battery, resistor, LEDs and a pole from each switch and use all mono jacks. Since you're using it for two channels on one amp you shouldn't have to worry about ground loops. You do have to worry whether this is one of those amps which invert the signal on one of the channels. Edit - actually, now that I look at it, that scheme seems to have some issues, see my recent reply in that thread. |
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Post by sumgai on Feb 6, 2011 13:05:54 GMT -5
....I'm REALLY impressed that he managed to do all of that inside the paper bag... Ya know what though..... I almost didn't let him in the door. Without that green hair, I didn't recognize him a'tall! ;D Oh, and The Real Boss ™ didn't stick around for his customary and expected Royal Due. Wunner why that was...... sumgai |
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Post by sumgai on Feb 6, 2011 13:18:25 GMT -5
....... You do have to worry whether this is one of those amps which invert the signal on one of the channels. Throughout its history, the Bassman (tube versions) has always had only two stages of amplification on each channel. That means that both channels drive the Phase Inverter with the same polarity. With very few exceptions, Fender amps use an additional stage of amplification for the Reverb driver, and that's what causes phase inversion, if and when the two channels are melded together. (This holds true for many other amp makers too, but it's not an absolute, only a rule-of-thumb.) HTH Oh, and we did plug in a channel jumper, as a test, which made for some interesting tones..... As usual, it'll take a certain amount of knob-twiddling to find just the right sweet spot, but both of us liked what we heard, even in that short time. sumgai |
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Post by ashcatlt on Feb 6, 2011 15:46:04 GMT -5
Well there ya go! What do I know? All my amps are virtual. I was promised a visit from sg a while back... Aw well, maybe wannastrat will look me up next time he comes around. One of these days I'm gonna find my way to cynical's farm, too! |
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Post by sumgai on Feb 7, 2011 12:18:45 GMT -5
ash, That was during the time of my 'hiatus', if you'll recall. It was simply a matter of bad timing, that's all. The other half has taken up the notion of going back to Duluth for another visit with Karen McTavish, world famous quilter extraordinaire. It'll be interesting to see if she really comes through, or if Life ™ pulls its usual act and gets in the way. I'll keep ya posted. sumgai |
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Post by ijustwannastrat on Feb 8, 2011 12:32:48 GMT -5
Ha, I won't be going up to Duluth any time soon. That's a summer trip.
What's it, 12MPH wind at 0 degrees? It's actually better up there than in St Cloud.
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Post by sumgai on Feb 8, 2011 14:09:23 GMT -5
wanner,
Don't look now, bunky, but you're next on the list!
;D
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