The reverb on the 1484-5's is driven by a 6CG7/6FQ7, basically a heavy duty version of a 12AX7. The 6CG7 is also used for the phase inverter and, the tremolo opto/oscillator is driven by a 12AX7, basically a Fender AB763(?) trem. The tanks can be very fragile, be careful with them, they can also squeal when a resistor is going.
These are awesome sounding amps which respond quite well to the Mosrite single coils and pretty much any pickup for that matter. The output trans on these are very small and saturate very quickly, a big part of this amps signature tone. New output trans are available from Weber and Mercury, the Weber being $100 less, in case you burn one up.
The downside to these amps is cheaper resistors and caps, especially the electrolytics. You will notice a night and day difference in tone by replacing ALL of the caps in the power supply and the cathode caps. And your amp won't burn up on you
Even with the work these usually need, you really can't beat them for the money, they're on Ebay all the time. If looking at one, check for gut shots and look for Red Atom caps in power supply and cathodes, these will need replacing, along with a new cap can. The original cap can is no longer available but, there are better ones with higher capacitance that will fit perfectly. A 3 prong power cord is also a smart upgrade, and you'll be able to disconnect the polarity switch too! No more shocks from touching your strings! Keep these things in mind before you shell out big bucks for one.
I've rebuilt several of these and really enjoy working on them so, if yours needs work, PM me. Lots of shops hate working on the old point to point wired bargain basement amps, call me crazy, but I prefer them. I'm currently building a clone of a Matchless DC30 but, it's 15 watts, with tremolo and reverb. OEM transformers and completely point to point wired, no tag boards for me! I'll post photos soon.
Rocco