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This will be running a pair of Magnepan 3.7z and the owner lives about 30 miles from me..He was asking me about about powder coating the transformers as I'm rebuilding it but I think it's best to just paint then with BMW brown paint.
Honest amplification is better than excessive 2nd order distortion anytime.
Follow Ups:
Michael,
Just catching up on reading... Is that a Heath W5M off to the right?
I have a pair that need to be refurbished (for the last 45 years) I'll
get to it!
DagWood
Such a nice piece of audio. Well designed and so well built.
charles
Bingo
They really are Charles but they really love driving planar speakers such as Magnepan,Martin Logan,Quad,KLH9s,and now recently,a guy is using one on a pair of Soundlab M2s.
Honest amplification is better than excessive 2nd order distortion anytime.
!
The Mind has No Firewall~ U.S. Army War College.
Absolutely right. I used to work in the powder coating equipment business, and the oven temperatures are above 350 F for most coatings; but there are some spacial low bake powders for things like the oil filled struts that hold open car hoods and trunk lids. Those are coated after assembly with the oil and O rings already inside. I seriously doubt you could find the right color in a low bake. I'd stick with air dry liquid paint.
By the way, powder is generally not self priming, so you'd need to pre treat the parts before coating to get good adhesion.
Jerry
So, would you not just remove the transformer and potting material, powder coat the outer side of the case and repot the guts? A bit of a mess but always wondered if there has been any advancement in potting that might be beneficial such as heat transfer.
Don Brian Levy, J.D.
Toronto ON Canada
Many rewinders in Hong Kong do that: pop the bottom of the can off and use heat lamps to melt the potting compound into a catch pan so that they can reuse most of the original potting material, which may contain PCB's.
I've seen the prints for a w-6 transformer and they potted the transformer with tightly packed crushed granite sand and then poured in the tar..
IIRC the potting does several things. One is that it damps the transformer core to keep it from potentially buzzing. Second would be slightly better heat transfer with the use of the tar. The potting case would also act a partial shield.
Companies like Algo Hamilton, at one time, offered transformer cases in aluminum, steel or mu metal for shielding. When I inquired two decades ago, the prices were a bit too steep unless I ordered in a large quantity.
You could powder coat with out fear of leakage if you build a jig to hold the transformer upside down. IIRC powder coating runs temperatures about 400 F
Yes, the potting compound has a tar base, but the filler is ground slate. Nit pick aside, you are absolutely correct about not subjecting the "iron" to serious heat.
A "balls to the wall" refurb requires stripping the magnetics and repainting. A good self etching primer is the foundation on which a superior job is laid.
Eli D.
If it were mine I would want to retain the original paint.The unseen modifications that Mike will do will make that amp sing with the best of them.
Thanks David.
Honest amplification is better than excessive 2nd order distortion anytime.
I'll like it more after you mod it and make it sound better than ever.
ET
As long as we are doing deuce photos, here is the one I just finished last night. Totally McShaned with every tweak I know of. Sounds glorious already... I think this is about Citation II #65 or so for me!
Enjoy yours!
cheers,
Don
Hi
What is the 3 terminal device on each board?
Thanks.
ccs
Don
I'm going to do the level 2 mod on my Mc275..I have done them on Mc240s and it works well but not everyone wants clamps on their clamps on their nacs but it can be done without the clamps because of the extra room...Nice job on the Deuce.
Honest amplification is better than excessive 2nd order distortion anytime.
Would you believe it sounds incredibly good now even tho it is bone stock with all original parts?I know how good it sounded when it was new now..
Honest amplification is better than excessive 2nd order distortion anytime.
Sure I'd believe it, they are nice, heard many and improved a few. Keep up the good work!
ET
It it really nice. I love the look of these.
I vote to leave them alone or just touch them up. If it were a ground up rebuild stripping it down to the chassis I would powder coat the chassis and transformers as I am not actually a lover of the the color.
Don Brian Levy, J.D.
Toronto ON Canada
I agree,especially with this being a factory built unit..Thank God for Jim's mods on these and the MACs as you can retain the value without destroying the physical architecture while at the same time making the amps reveal their hidden potential from the day they were designed.
Honest amplification is better than excessive 2nd order distortion anytime.
PLEASE ADVISE INFO ON THE BMW BROWN PAINT FOR THE CITATION II TRANSFORMERS OR CHASSIS. thanks
I will ask Jeff or you can email him thru the asylum..Mr9iron is AA name...Here is the one he is doing.
Honest amplification is better than excessive 2nd order distortion anytime.
I would keep it factory stock appearance. These Citation II are pretty enough from the factory.
Now, with my shortwave radio hobby, IMO the BC-348 was too ugly to keep factory stock. So, I have this highly modified BC-348.
wow that is beautiful.those have to be one of the most modded govt surplus radios that ever was.i myself have a unmolested bc348q ,and a m.
real radios glow in the dark...
WOW
I have a BC348 but I love the layout mods you made..Very nice.
Honest amplification is better than excessive 2nd order distortion anytime.
I like the build quality of the Mil Spec gear somewhat like that Citation II (high quality). Performance of the BC-348 is good, check out this link. http://www.w1vd.com/BAreceivertest.html
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