i had a moment today so i powered it up, R113 started to smoke so i guess that the heatsink was slightly underrated, but ill chaeck up on it if i get som time this week
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Show posts MenuQuote from: Enzo on February 20, 2016, 06:14:35 PMi was referring to TSA1....was aware that the transformer had a thermal fuse inside i is shown on the 2nd page, but i had i confused with one of the primary windings, i feel a bit stupid now.
Thermal switch? Do you mean the thermal fuse inside the transformer? That is usually not in a schematic because it is not a separate part, it is part of the transformer.
Quote from: phatt on February 21, 2016, 05:49:50 AMwhen i first opened it i thought the heatsink to be somewhat underrated event though it is directly on chassis
And don't forget TSA1 (Thermal cutout) mounted on the heat sink as well.
I worked on one of these amplifiers a while back,,, watch out for heat issues on R172/173 and R160/161.
Those were running so hot they had burned the PCB and de-laminated the traces. (not much R/D from Fender design team went into this one :loco)
CR56/57 were also overheating. Expect finger burns from them.
If I recall correctly, I had to remount those parts off board.
R37,38,39 (although not as hot) were raised higher off the PCB to keep the heat off the PCB.
Phil.
Quote from: LeftysquireAm I crazy?Yes, sane people do not insist on building their own gear, they buy stuff that works...or seems to work.
Quote from: RolyJust out of personal curiosity whereabouts are you? Here in Aussie it's nominally 240V single phase and 415V phase-to-phase (and yagotta wonder how anyone could even manage to do that).I´m im Europe, it 400VAC not 380, it was a Studiomixer power supply, when it was fixed i returned it at the sudio to check i mixer was fried also, and i asked him what had happened... he was goin to put up some new lamps an then everything just went black... some how he had konfused the conductet to the lamp out with L2 and somthing with N, any how hed had 400VAC on all outlets in the listening room, apperently the PSU rectifier bridge protected alot of the equipment.
Quote from: ogeecheeman on May 07, 2015, 12:38:39 PMbut why, ?
ok.amp comes in-user replaced bridge rectifier.installed backwards.