The Ceriatone 5E7 amplifier is based on the tweed-covered amplifier of the same designation. If you have a schematic or layout that’s not on this list, please send it to us and we’ll put it up. The classic American amplifiers of the ‘50s and ‘60s inspired us to create the, errrrr, American Classic series. We believe that this is the most complete, highest resolution collection of vintage Fender schematics available on the web. These are invaluable reference tools if you are digging around inside of your vintage Fender amplifier.
5E7 BANDMASTER FOR FREE
Here are hundreds of original Fender schematics and layout diagrams, available for free viewing and download.
5E7 BANDMASTER MOD
"1/2 Blackface" Mod for Ultralinear Fenders.I've attached a couple pictures of my bias probe readings as well as the schematic and layout for my bias circuit. So something's wrong with the power supply or the bias circuit. The tubes are still biased cold and I'd need to replace my 3.3k bias range resistor to get more adjustment. If I adjust the bias pot all the way down (minimum resistance) I get ~52 mA but the plate voltage drops down to 315V, way below where it ought to be. I see 348V on the plates (should be closer to 415V) and my bias probe shows ~40 mA of current, resulting in 13-14 watts plate dissipation. I wanted to solve the noise issue first, but maybe these are related. Apologies for not mentioning this sooner. Regarding amp operation: the thing that's puzzling me is that the amp doesn't seem to want to bias correctly. The junction of the two 270k and 4.7M resistors seems the most sensitive (it's very loud) but pin 2 and the wire joining those two points all produce a lot of noise when touched. I've also tried swapping V2 for a new 12AX7. Tapping V2 does not induce much noise tapping pin 2 directly does. Regarding sensitivity: the tube does not appear to be microphonic. Have you tried tapping on the tubes to see if they are just as sensitive (or more so) than that junction? The loud thump could be a microphonic preamp tube. It's amplifying a (roughly) 100mV signal up to over 40W!!! Even vintage amps could be considered very high gain by other types of amplifier standards and that can make some very high sensitivity. The modifications include a grounded power cord, modified bright cap, PaulC phase inverter mod, Pre-PI master volume, a bypassable extra gain.
The amp is based on Sean Kilback ‘s modified Fender 5E7 Bandmaster schematic. In the summer of 2009 I finally finished my guitar tube amplifier build. Even with a chopstick sometimes, as recently noted by one of our other posters.Īssuming your cathode voltage is correct (which I believe it is) what problem are you having with the amp in operation? I suppose with that V2 lead being so sensitive I might use a shielded cable for it. Krogerus Bluesmaster 5E7 Bandmaster Build.
5E7 BANDMASTER DRIVER
40w of tweed fed through a 3x10 alnico blue driver configuration. This is the circuit that Townsend loved and Joe Walsh loved so much he now has a signature amp by Dr. With its presence control and the three 10 inch speakers, you will get a nice clean sound even at louder volumes. Is the sensitivity on this V2 lead causing some instability in the amp in operation? Hum when touching a lead is normal. Excellent clone of the Fender 5E7 circuit, the Tweed Bandmaster. The Tweed Bandmaster 5E7 is a great amplifier if you are looking for a little punch, power and clean headroom but still want to keep the spirit of the legendary Tweed sound. Notice that the following stage has a higher supply voltage, the same plate resistor value and the same cathode resistor value but only shows 1.7V for the cathode voltage.
5E7 BANDMASTER PRO
which shares a lot with the Super, Bandmaster and Pro amps of that era. Modeled on the 57 Bandmaster 5E7, this Lucas Miles Vintage Series amplifier faithfully replicates the sound of another of Leo Fender’s masterpieces. Typo on the 2.2V spec for the cathode in the schematic. The T35 covers the 5F4, 5E5-A and 5E7 circuits for the Bandmaster, Pro and Super.
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