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In Reply to: RE: Dyna MK3 Transformers posted by mark.korda@myfairpoint.net on June 07, 2015 at 14:22:26
Hi Steve, I've had these Dyna Mark 3's for ever. They left my possession around 1982 where I took them apart. I traded them to a friend who I later lost track of. He resurfaced later and I got the amps back in a trade and an old Ford Ranger for a paint truck.They stayed in a project box for 15 years in my small cramped studio. I have moved and now I have room for stereo projects.I just used your idea on the variovac only using 20 volts.I did my Jethro Bodine math and both power transformers passed with flying colors, thanks to you, again,thanks! I have thru the times collected every thing I need to make these new,circuit board,chokes,800 volt cap replacement board and even a 2 new,or old packets of hardware from the old Stereo Cost Cutters from Ohio. They bought the last remaining Dyna tube stuff before it was re manufactured again not to long ago. The last hurdle before I have the fun of assembelly is to get the chrome chassis sand blasted and hopefully powder coated a Cleveland Browns orange or McClaren (Can-Am) orange, same color.I think that would look cool with the brown cages. Without a little info and push by you Steve, they might have ended back in the box....I'll have some pics for you....Mark K.
Follow Ups:
Good to hear things worked out OK. However.......testing at the low voltages you describe verify the ratios under unrealistic conditions. If they were mine, I'd perform one more test: wire in a 1amp fuse in series with the primary, make sure all secondary leads are separated and not in contact with anything and plug into 120VAC. The test here is that the fuse doesn't blow immediately or after a minute or two. If it passes this test too then you know internal insulation is good at operating voltages. Good luck with your project.
Hi Steve, thanks. Besides the 800 plus volts measurements I turned up my variovac to 120 volts on the lower voltages and both transformers were mirror perfect in measures they needed to achieve. Would that be ok? Thanks Mark...Thanks you others for the pep talks...love em!...Mark.
sounds like a very enjoyable project. I had the MKIII with the KT88 tubes. One of my all time favorites!!!!And I was very sorry I sold them for the silly reasons I did.
One day I would like to get back into a ST-70 kit from Bob Latino
charles
Edits: 06/10/15
Mark, I think you will have fun.
I have 4 Mark IIIs. Two where relatively complete, one was mostly complete and the 4th needed PS iron and a complete rebuild.
Over the last few years I was able to get all 4 working great with new caps, Curcio boards and iron.
looking for some jazz and a little libations - joe strummer
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