Measured with a DMM the value is about 500K.ġ) All Signal Coupling Caps Changed to 630 V Poly Film Caps.Ģ) Vibrato sections caps changed to poly-film 630 V caps.Ģ) bias and power supply caps are Sprague Atom.ģ) Anode reference Caps are Brand New Electrolitics. This is an Export bandmaster model, the changes from the original design are.Ģ) Bias Circuit "blackfaced" (220K resistors, different wiring in the bias adjustment pot).ģ) A non-standard volume pot for the vibrato channel, no values printed on. (sure it screams loud when i engage the bright switch!) No pops or cracks just a little high pitched oscillation when i connect the reverb tank. However this is rare because the owner (a friend) have this amp running with a 2x12 guitar cab loaded with celestions (the lower series G12XXX). Little Hum and Hiss (like any guitar amp will do). (reminds me to creedence clearwater records). Again check your speed and intensitypots for bad solder connections or faulty pot. It one of them has gone, it would not allow the neon to work. The trem as has a couple of electrolytics you should check. It is possible that it is the transformer, but I would doubt if it would hum if it was gone. Have you checked your reverb control pot? Do the solder joints on it look good and what does it read with your meter? Does the hum get louder when you turn the pot? If it is bad that could be part of the problem. There is a 25uf/25 volt electrolytic capacitor that is in the reverb circuit (check it), if it has gone bad as they tend to do in these older amps it would do what you say the reverb is doing. Does the amp sound good (excluding the trem and reverb issues) or does it sound "squashed" sometimes when you play harder? I would however check your bias to make sure that both power tubes are getting the juice they need. I have many tubes over the years like that. The blue colour in the tube is nothing to worry about, it is like someone said, usually just an internal coating or a deposit in there causing it to look blue. Measuring at DC resistance one gives like 200K ohms and the another almost zero. Someone said that i could use a xmas light bulb.Ībout the reverb. i can't find a suitable device like an NE-2 Bulb here just pilot neon bulbs and similars. somewhere i read that the sine wave produced by the tube oscilator is 200v sine wave, so any neon bulb with a voltage rate of 220 will work?.Īccording to some text, the original bulb is a NE-2 Model. Which Neon Bulbs will work to replace the bad one?. (accutronics long delay don't remember the numbers)ġ) one power tube has a blue light inside, the other doesn't but both has the same amount of heat after using the amp like 30 minutes.Ģ) the reverb just hums and got just noise., it seems that the reverb is not getting any signal.ģ) the tremolo doesn't work, and i can't see the neon bulb working from the optocoupler. I'm havin troubles with this bandmaster TFL5005X.ġ) New pre and power tubes, rectifier tube.Ģ) New coupling caps and Tube Oscilator Caps.ģ) The amp sounds good, just a little hiss in the background and normal hum with single coils as any guitar amp would do.Ĥ) Reverb Pan is New.
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