![]() ![]() ![]() You may have to play around with the cathode bias level to put the operating idle point in a good spot. Similarly you could try a 12DW7, with the low mu triode driving the intertage - the higher turns ratio may counteract the low mu, and the lower ra of the low mu triode may provide a softer overdrive where the output stage grids start to conduct noticeably. Adding primary side resistance (15k) and/or adding secondary side resistance, can tailor that high frequency response, and so may be worth playing around with (adding secondary loading will reflect back to the primary, and so 15k could be increased). ![]() The output stage grids present no loading on the interstage secondaries up until grid conduction starts to be noticeable (perhaps a volt or two below 0V grid drive). The high frequency response of the driver stage would be worth measuring, if only to avoid an excessive corner frequency peak or roll-off. In effect, you won't need to driver the driver stage as heavily. The interstage acts a voltage transformer, so if you are using a transformer with a higher turns ratio than original, then that won't stop the amp from driving enough voltage on to the output stage grids. It’s so much lighter than an SR, and you can Crank It Up at 30 Watts it’s a lot easier to hit The Sweet spot without melting your ears like the SR.The A53C primary is rated to 10mADC for single-ended stage, so that won't be a worry. Audio Amplifiers Schematic and specifications : 748 KB: A-7E: Audio Amplifier Schematic only : 268 KB: A-9A: Audio Amplifier Schematic and specifications : 695 KB. I might try doing the Fender Dumble mods or? I may just add a tone stack +/- on the first channel and be done with it. Requirements but I’m pretty sure I can do that. It’s designed around the 5u4 rectifier, which of the top of my head I think I can go up to a GZ34 or down to 5圓? I got to check the specs on the power Transformer vs rect. I just need to recap it, although they are 100% original and not humming or acting up but it’s just the smart thing to do. Re: Dating a SF Fender Musicmaster Bass amp - CL find Thtas a 12' oxford made speaker, these amps use a phase splitter transformer, not a tube and as such have a tone in some ways all their own They also have NO FUSE only a thremal protector, and I do not know how Fender got away with getting it UL listed for production. I’ve already replaced the baffle with a 12″ low wattage alNico, and ceramic 10″ Mojotone. I do love the fender reverb and tremolo sound, but when you leave them out then the channels are in phase as someone said above, and that allows you to jumper both channels like a Marshall, or even run one channel dirty and one channel clean at the same time. It was 100% stock and it’s still blew me away, after rotating the pots back and forth a bunch of times because they had been sitting for so long that it screeched and howled when I first plugged in. I just didn’t want to lug the super reverb around anymore and I had seen the Bantam collecting dust for a couple years. I bought mine for $300, as I was selling my Super Reverb, an amp style I’ve played for 30 years or more. The Fender Amp Field Guide: Descriptions of the greatest musical instrument amplifiers ever built organized by year and model.
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