![]() ![]() It outlined the 2nd-order harmonics with a sweet sound but not cutting edge glassy. I was especially impressed with the top-end frequency tone. I found the Winged-C also handled the mids and upper frequencies well. I wanted a tube that reproduced sound accurately and that was had good bass reproduction, since I occassionaly played bass through the amp. When I retubbed after studing all the available new 6L6 types I ended up using Winged-C (SED). Philips 6L6GC are also original quality type. Your left hand pair of 6L6GC power valves look like a 1st generation Chinese type because of the coke bottle shape. It is much easier to clone an amp when you have an original amp. Also I would add any improvements the the clone amp. Ideally it would use turret board or eyelet construction. The idea was to end up with a Dean Markley clone. While I was upgrading the amp I had started to build a duplicate using a form of tag-boad construction. They are one of the few that are high voltage and appropriate quality. On my T-120R in the PSU section I replaced the electrolyic capacitors with RIFA brand. Not quite sure of the 'new' resistors' purpose.Īlso small ceramic cap soldered directly on the leads of the 220k R near the 'Bass' pot, presumably the 220k on the wiper of the treble circuit.another mod that im not sure is necessary and am a little mystified to its purpose. Unless this is bias related I plan to reinstate the track using 0 Ohm resistor. The underside of the board, another resistor_47k?(added by SOMEONE) connected to one leg of a 5k preset pot(bias?), and the original track scratched out. I plan to replace these all just in case. Reading some of the advice and literature, the latter of which there is little about, I checked for brown board, and found diode on the PSU board, and a couple of resistors overheating.ġk 'RCD' type W/W resistor guessing 500V and 2-5WĪll these components within a small area of PCB discolouration, the RCD resistor and diode being the main contributors, by appearance. I always end up going for my old 'safe' option, slinkys, whether the LP or strat just coz the tone seems to last 2 or 3 times as long. I find they sound like no other string, in a good way, but the tone is gone SOOOO quick. Its a stunning guitar head, I think it deserves a fix up, so I can see what it can really do The pre tubes are almost certainly original GE's to the best of my knowledge. I now suspect these either to be the originals, or early replacements. ![]() The stubby PM valves seem to show the dissipation, and the Phillips seem far more capable of tolerating the biasing. Im planning on replacing the electrolytics too due to the age of the amp.Īs for power, its a claimed 120watt, and from what ive read, or been told, it has quite a heavy bias. The auxiliary mains output has been disconnected, which is probably no bad thing since I wont use it. The pots are a little dodgy, it had some surgery to the internal wiring. using that advice, I'm hoping to renovate the amp a little. Yeah it works fine, probably due for new valve in the output side since the 2 pairs seem so very different considering they're both supposedly 6L6GC's.lolīasically, as I shouldve said in the beginning, this thread was the spawn of an earlier thread: I know little about valves but I look of them better. If you look closely they have radically different structures inside, and the Phillips ones look very interesting. The pre's are all " GE 'Electronic *something* " 12AX7, The left pair of output tubes are " PM '6L6GC' ", and the right hand side pair read something like " PhillipsECG '6L6GC' ", and also the letters " ha AGX " The writing on all the output valves, as well as the pre amp ones is very hard to read. All of the valves in general seem fairly old, though not really smokey. Here is some pic of my 120R, s/n t120r-047: If this interests people then its a bonus, but I think this restoration may be slow Still, I plan to 'restore' it, for want of a better word, and I will document as much as I can in pictures, and component values,(for those, like me cant read DMs schematic). Until recently when with the help of StephaninMelb I hadn't a clue! Hey I was a toddler in the 80's. I have been researching the Dean Markley t120R i own, since I inherited it and no little about it. ![]()
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