I got some gently used 22uF 350V radial caps (OK not so gently used, they came out of electronic ballasts) that would fit in by the rectifier. Again, if it were I (we're still having fun right?) I would use the chassis and gut the wiring and possibly put a plate in where the filter cap is and use the space for a 6AT6. I was debating whether to go 6AT6 or 6AV6 (The 6AV5 was a typo), I do have both. I really do believe it's the very best choice for the overwhelming majority of players who aren't nationally touring acts. Starting with a 5F1 makes a lot more sense, and I know for a fact I wouldn't have wasted my time churning through as many amps as I did over the years if I'd started off with a 5F1. I came at this stuff backwards, trying to restore dead Super Reverbs and Bassmans when I didn't really understand how any of this stuff worked. That tells me they should build a step by step diagram Champ kit first. Especially when they think the big multi-section can was what I was referring to when I said there was a death cap on the supply. I just like to err on the side of caution when someone is asking whether they should tackle a gut and replace project like this as their first tube amp build.
Point taken about the OP and the journey of a thousand miles/single step/etc. I've had so many of these Kalamazoos literally crumble apart just from normal knocking around and especially shipping. I do like your idea of building real cabinets for these amps, though. Even with a 5F1 or 5F2A circuit, I still prefer my real 5F1 and home brew 5F2A to any of the Kalamazoos I've brought back to life. I also think at the end of the day I just prefer the sound of a single ended 6V6 to a single ended EL84. Even with a beefier OT and a nicer speaker, I still find the Kalamazoo to sound smaller and blander than a 5F1 or an AC4. No bypass caps on the first stage or the EL84's cathode resistor, oddball single cap tone stack vs. My first few Kalamazoo restorations I did just replace the speaker and OT and leave the rest of the circuit as-is, but I still feel a straight 5F1 circuit sounds much meatier. I think you forget the rest of us aren't a good point about the sound of the circuit vs. I like your idea of a 5E3 with 6K6s a lot better, but again, I wouldn't recommend such an involved gut job unless someone's been building amps for some time. I think I have one or two left that still have intact cabinets, and I'm sure they're on borrowed time as well. I did so many of those for myself and friends but those cheap particle board cabinets are prone to crumbling even if you keep them at home. I'd score one for $50, replace the OT with the Vibro King reverb transformer, swap the speaker out for a Celestion G10L-35 and rewire it as a 5F2A without feedback. I used to pick Kalamzoo 1s and 2s off eBay for a song before people started talking them up as great harp amps. Do you do something to yours that makes them acceptable? They're kind of an EL84 Champ but the speakers are terrible, the OT's almost hard to see without a microscope, and the circuit sounds flatter and a lot less gratifying than a 5F1. Better to start off down that path with a proper, easy to assemble amp kit like Hackworth's.Īlso, Kalamazoo 1? You really like those? I've never warmed up to those amps in stock form. I agree you could conceivably wring a Kalamazoo Model 1 out of this amp, but given the OP's level of experience, I wouldn't recommend a "gut everything but the iron and start over" project as someone's first DIY tube amp. Let us know how it goes, and make sure your affairs are in order. I wouldn't mess with this thing, but I'm pretty sure you will. 01mf death cap hanging off one side of the AC, which could, um, electrocute you when you become part of the circuit by plugging your guitar in. There's also the niggling matter of that 2-wire AC plug and corresponding.
If you bypassed the input section surrounded by the dotted line and just plugged your guitar into the input directly feeding the 12AX7, you might hear something out of the speaker, but it won't really sound like a guitar amp per se and your only volume control will be the one on your guitar. Here's the schematic, because I'm a sadist I guess. I know it's the fever dream of every scrounger who's come across an old console pull or tubed record player, but none of these amps are anywhere near a tweed Fender away from just a "line level" resistor swap.
Magnavox all transistor schematic mod#
There is no simple mod that will make it one, short of gutting the circuitry and redesigning an amp around the existing iron. I would also advise just simply forgetting about turning this into a guitar amp.
I agree with muchxs that you should ignore the 9V line coming from the phono section, and either tape it off or clip it at the circuit board so it won't come into contact with anything.
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