Fender_super_champ_mods 电路图 维修原理图.pdf
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1、Fender Super Champ Modifications These details are believed correct but the author cant take any responsibility for what happens if you attempt them. Valve/tube amps store lethal voltages even when switched off and unplugged from the wall, and if you dont know what youre doing, you can be badly hurt
2、. RELIABILITY MODIFICATIONS As l describe the works, Im standing with the chassis front panel nearest to me and the row of valve/tube sockets (were looking at the wires side of those, not the valve side) running along the far edge of the chassis. The output valve sockets are the last 2 on the right.
3、 Please note that this writer has only done these mods on a Princeton Reverb II, not a Super Champ, but the 2 amps are very similar. If youre going to do both mods, test the amp after each one. 1 Upgrading the Bias Feed resistor Failure of the bias feed resistor is the single most common reason a Su
4、per Champ will die. This mod makes sure it wont happen to your amp. After dismantling, this takes 5 minutes, costs about 35 cents US, and could save a lost gig and a trip to the tech. PHOTO A This photo is clipped from the excellent Super Champ chassis photo on 收音机爱好者资料库 Ra d i o Fa n s .CN (enter S
5、uper Champ in the search box at the left of the screen) The little resistor identified by the green arrow I photo A is 47 ohms (yellow, purple, black). 47 ohms is correct, but the wattage isnt big enough on some Super Champs - in other words its always in danger of overheating. The one in this photo
6、 is probably OK but on some models its smaller and may be badly discoloured from overheating. If it fails there will be no bias supply to the output valves (tubes), and if that happens, theres nothing to stop the valves from running at a very high idling current, which they probably wont take for ve
7、ry long. The danger of this component overheating is the same at high or low volume. The solution is to replace it with a 47 ohm resistor, one watt or bigger, wirewound. More than one watt is OK too, but much more might be too big physically. It will take you 5 minutes, not counting the trip to your
8、 local component shop, and dismantling time. Careful not to overheat the diode next door while soldering. PHOTO B NB this is a photo inside my Princeton Reverb II, NOT a Super Champ In the photo above, the new bias feed resistor is the white rectangular component circled in green thats one type of h
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