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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Marshall JTM312H, 1996
In for a mechanically broken pot but the rear cover looks nasty to me.
The schematic I have just says 2x 5881 output bottles. In there are 5881WXT , is there squat versions that should be in this model ? The non-H suffix rear looks similar to this 312 http://medias.audiofanzine.com/image...997-534172.jpg The bottle tops touching the metal. Someone has padded out the 3 screws with nuts and added some distinctly brown , and compressed to 1mm not high-temp foam , but as the 3 retaining tongues , at the other edge of this cover, are not now resting on the chassis , its probably not affording much protection. Soft silicone rubber pads and some sort of hard standoffs to fit around the tongues ? I'm thinking some FRPB strip slotted to take the flat metal tongues. |
#2
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Marshall JTM312H, 1996
N_Cook wrote:
In for a mechanically broken pot but the rear cover looks nasty to me. The schematic I have just says 2x 5881 output bottles. In there are 5881WXT , is there squat versions that should be in this model ? ** Yes: http://upload.wikimedia.org/wikipedi...acuum_tube.jpg The standard Russian 5881 has no base, the WXT is a special ( taller) version for amps that have shark-jaw clamps. There is a socket made for the standard version with a screw down metal cover - kinda makes the valve bullet proof ;-) ..... Phil |
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