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Old 10th June 2011, 08:52 AM   #381
SimontY is offline SimontY  United Kingdom
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I knew you'd like the 2nd tx
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Old 10th June 2011, 09:18 PM   #382
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Blissfully unaware as I am of any mysterious electromagnetic restrictions on my placement options, I've secured the second transformer orthogonally on the back plate of the chassis using the original mounting bracket.
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Old 13th June 2011, 07:31 AM   #383
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Nice work!

I think you are now officially the second person to do the tx mod. Very worth while it is too

Brent
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Old 14th June 2011, 03:29 PM   #384
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Oh man, so worthwhile. It's a huge improvement. My 805s are loving the extra juice and revealing more crisp details and producing deeper and tighter bass than I could've imagined (and I used to have a sub!). I joined DiyAudio in '07 because of this thread and I've wanted to get to this point for all that time. Even with that long build-up, this mod has surpassed my expectations :-)
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Old 14th June 2011, 03:41 PM   #385
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Yes very big gains. This is why when I upgraded from the Marantz I had to buy the ATC amp as most 'very good' amps were not as good as the Marantz

Brent
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Old 15th June 2011, 01:03 AM   #386
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Hey guys, any opinions on whether I should bypass my 10,000uF Black Gates with some good film caps?

I was thinking of running some Mundorfs across them but I'm not sure of the best values or whether I should do it at the PCB or cap terminals. I've heard rules of thumb quoted of 0.1%, 1% and 10% or even all three.

Also, is it worth bypassing the 1000uF filter caps?

Cheers,

Ben
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Old 15th June 2011, 07:16 AM   #387
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It may be beneficial to bypass the main smoothers with 0.1uF & 1uF 2% Mundorfs.

Brent
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Old 15th June 2011, 10:46 AM   #388
SimontY is offline SimontY  United Kingdom
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Brent, I think Ben means 10% of the main cap value in uF, ie. 1000uF (not capacitance tolerance).

I think the problem with the typical 100nF sort of range bypass caps is a) their impedance is too high for them to work properly and b) they only act at very high frequencies causing an uneven impedance curve - this can be alleviated with a series resistor, something like 1-5R. There is a thread on here showing scope measurements of different bypass caps.

I would suggest 100uF or 1000uF BG to try. And if you can get a film cap right up next to the transistors that is also a good move.
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Old 15th June 2011, 11:03 AM   #389
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I knew what he meant!

I was suggesting the 2% Mundorfs as they work very well in those positions and have a good ESR figure that will no doubt be much better than the BG. I would not want to strap a cap across a decent BG like those and add something worse in terms of esr and ripple rejection

Brent
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Old 15th June 2011, 03:25 PM   #390
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Thanks guys. I looked at what was available to implement Brent's suggestion and ended up trying Mundorf 1uF/1000v SO and 0.1uF/1200v SGO in my shopping cart for size. Overkill? They're pricy, but so were the BG. I think I can get more certain gains elsewhere for that kind of investment.

As per Simon's suggestion - well, I don't have many Black Gates left (who does?), but I do happen to have a couple of 100uF/50V "K" to hand... which is interesting! (Are K as good as FK? I can't remember). They're just lower than the 56v specified rating for the smoothing caps. What do you think?
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