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Building some amps.


 
9/11/2000 1:19 AM
Richie{~}==:::
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Building some amps.
Just posting to kinda do a before and after project. I'm building a 5F6A bassman type amp.The person wanting this built brought me a BF bassman head.It has already had a few holes drilled and an extra tube hole for a reto tube. It also has the SS board in it too.The parts were bought, and all this brought to me to piece together. A new Sensor PT and Hammond OT. The caps are from Torres..matched i guess with his name on them..Orange drop spragues,and some Mallory.  
I have the transformers,choke,and a few other things mounted..and a turret board. I'll let you know what it sounds like when i get it done.Oh.. and don't call me a hacker.. this was hacked already when I got it,and its what the person wants..So I guess its better having something made out of it..than it just sitting there gutted,hopefully it will live again and be a good sounding amp for a few years to come.Any suggestions would be appreciated..I just got through with a 2203 75.. weird.. it was built more like a 2204.. And a pro reverb i finished today..had a name stamped in it.. and the name seems familiar.. maybe some of you may have heard of him? (Richard Hand) guess he was the one who built it. or tested the amp..  
Richie{~}==:::
 
9/11/2000 12:44 PM
Peter S
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Richie,  
FWIW, when I build Tweed Bassman style amps, I prefer the 5F6 circuit, and I just delete the 25uf bypass cap on the second stage cathode. I also usually use glass epoxy board instead of the vulcanized fiber, although I use the fiber boards if I'm building a replica that I want to be accurate. I also usually use a 16uf or 20uf decoupling cap for the preamp, I think the 8uf cap is too small......a 16uf here significantly improves the tone of the amp IMHO. The Mojotone Bassman OTs sound great.....never used a Hammond OT. If the NS PT has the 5v windings, maybe you can make it switchable between tube and SS recto.  
I like to use a 5751 in the first stage of Tweed Bassmans, but there still are some 12AY7s floating around. Personally, I think the Orange drops sound too bright in this type of amp. I used to use 'em but not anymore. The tin caps from Angela don't have as much edge to the sound.  
 
Peter S
 
 
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9/11/2000 8:52 PM
Richie{~}==:::
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I agree Peter.. if this were mine i would build it alot different, but he has bought all the parts .. i'm just the laborer magician..lol Thats why i said i'd post how it turns out. I have a few tricks i may try to get a little bit better tone from it..And wondering if these magical measured caps from Torres is worth all the extra you pay for them..  
Richie{~}==:::
 
9/11/2000 9:07 PM
Peter S
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Richie,  
I know a guy who used to build Tweed replicas. He used to match the Sprague 715 caps to within 1%. He's no longer in buisiness. I don't wonder why. His amps were well constructed, but I never much liked the harsh bright tone of them. They certainly didn't sound anything like Tweeds. FWIW, the best sounding Tweed replicas that I've heard yet besides mine(I know, I'm biased so just ignore that part), are the Victoria amps. Mark advetises that the caps have been intentionally compromised to help get that authentic sound. I always just use NOS caps, and I measure 'em to make sure they aren't leaky and aren't too closely matched..... they need to be off by 5-15%.....the original had a 20% tolerance.  
 
Peter S
 
9/11/2000 9:08 PM
Rebel420
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Let me know if you need a 12ay7, i have a couple of those laying around myself ;)
 
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