RiStaR Posted August 29, 2014 Report Posted August 29, 2014 Had a few requests for this... In terms of a drilling template for the Megatron. I don't have CAD or anything, but this is the jpeg I did out for the drilling of my chassis. I'm not sure if it's useful to the rest of you but it's the closest I have. For the rest who have already built one, if you have something much more accurate, please share it.
eggil Posted September 20, 2014 Report Posted September 20, 2014 (edited) Finally finished casing the power supply. Next is the amp itself. I am still not sure how I am going to do it. Wood or metal. Edited September 20, 2014 by eggil 1
JoaMat Posted September 20, 2014 Report Posted September 20, 2014 Very nice PSU indeed. I like the external heat sink approach. Is that yellow thing a Neutrik powerCON?
kevin gilmore Posted September 20, 2014 Author Report Posted September 20, 2014 green amphenol military connectors. Definitely the right way to go. very nice.
eggil Posted September 20, 2014 Report Posted September 20, 2014 (edited) Yes, it is a powerCon, per Birgir's suggestion. External heatsink idea courtesy of Victor Chew and RiStar. Thank you guys. Edited September 20, 2014 by eggil
FrankCooter Posted September 21, 2014 Report Posted September 21, 2014 Your work looks great. I particularly like the way you've handled the heatsinks and the chassis in general. My only criticism is that you can still work on the wire dress a bit. My projects always look like a mess at first pass. It usually takes me three revisions before I'm satisfied, and even then, there's always things you would change if you did the project a second time. It helps to wait a few days before each revision. Putting the project aside for a while clears your mind and gives you a fresh perspective.
eggil Posted September 21, 2014 Report Posted September 21, 2014 (edited) Thanks Frank. You are right, wiring is still quite messy. Edited September 21, 2014 by eggil
nopants Posted September 29, 2014 Report Posted September 29, 2014 Have you checked temperatures in your PSU after prolonged use?
eggil Posted October 1, 2014 Report Posted October 1, 2014 60 degrees Celsius on the sink part where devices are attached to. The heatsinks themselves about 42 degrees at the fins.
mick2244191 Posted October 13, 2014 Report Posted October 13, 2014 hi guys. i have followed this thread for long and almost finished my megatron. But something bad happened. I have to pay for my dental payment and never have time to finish it. I have to sell my half-finshed megatron includes tubes. I posted the classified here: http://www.head-fi.org/t/738271/for-sale-el34-12au7-12ax7-and-transformers
kevin gilmore Posted October 21, 2014 Author Report Posted October 21, 2014 updated the board layout for c1815/mpsw06 http://gilmore.chem.northwestern.edu/boards/megatron.zip
jdineshk Posted November 5, 2014 Report Posted November 5, 2014 I have a few PCB sets available for this amp, US $75 plus shipping. The boards were made by PCBnet in the US, 0.093" thick with 4 Oz copper. The set is three PCBs (Megatron amp board, KGSSHV PSU board and one Stax jack PCB). To be clear, this is not the latest Megatron that Kevin posted on Oct 22nd. These were made two weeks before.
kevin gilmore Posted November 5, 2014 Author Report Posted November 5, 2014 the update on the board was for the mpsw06 transistors because the 2sc1815 are hard to get now. otherwise no difference
nopants Posted November 5, 2014 Report Posted November 5, 2014 Is it possible to use the e80cc in place of the 12au7?
kevin gilmore Posted November 6, 2014 Author Report Posted November 6, 2014 probably should work. double the filament current, so account for that.
shun0321 Posted December 7, 2014 Report Posted December 7, 2014 Hello everyone I read it several times and this trhead but there is some information that I did not understand (for my poor english). EL34 pentode or triode configuration are? There is autobias circuit for the el34? What is the role of C1, C2, C6 anc C8? Thanks at all and thank to kevin for his work!
kevin gilmore Posted December 7, 2014 Author Report Posted December 7, 2014 triode mode no autobias, if the tubes are reasonably well matched and the power supplys are correct the most offset I have seen is about 5 volts c1/c2 couple from the differential input stage to the second gain stage. c6 and c8 do the same thing to drive the outputs
shun0321 Posted December 9, 2014 Report Posted December 9, 2014 Thanks kevin, I saw the board psu. there would be a real advantage to duplicate the part of +/- 450V?
shun0321 Posted December 10, 2014 Report Posted December 10, 2014 The 6V volt filament is in AC? There is many version of universal psu that have 300V out? there is a version of the psu that has the output to 300V? the universal psu has a 'input to 75V AC and then you go to add to -450V, getting a -510V. you can not modifacare that to have the 300V output? Sorry for the newbie queston!
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