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Old 7th December 2017, 08:09 PM   #11
Steve Morley is offline Steve Morley  Canada
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One more, well really two more things:
1. Tungsol reissue 12AT7 are decent, almost as good as NOS Mullard and not nearly so flaky and fraught with problems.
2. Try replacing the coupling caps (C3, 4, 9 & 10) with mid grade Mundorfs. Even the standard Supreme (about at about $11 each) should provide a sonic lift. Just put 50 to 100 hours on them before judging.

Steve
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Old 8th December 2017, 12:06 AM   #12
Mancave62 is offline Mancave62  United States
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Quote:
Originally Posted by Steve Morley View Post
One more, well really two more things:
1. Tungsol reissue 12AT7 are decent, almost as good as NOS Mullard and not nearly so flaky and fraught with problems.
2. Try replacing the coupling caps (C3, 4, 9 & 10) with mid grade Mundorfs. Even the standard Supreme (about at about $11 each) should provide a sonic lift. Just put 50 to 100 hours on them before judging.

Steve
Yes, Steve I'm already using the Tungsol 12AT7 (great recommendation), as for coupling caps, I went with Wima MKP-10, fit really nice, I've been so tempted to go with the Mundorf upgrade but I have liked the sound from this amp so well I've stalled, since you recommend I guess I'm gonna have to do it..I'll let you know how it turns out...Thanks man, Cheers...
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Old 13th December 2017, 12:37 AM   #13
Mancave62 is offline Mancave62  United States
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Default 6550 tube

The 6550 tube in this amp is by far my favorite so far. Wow, I have done many many comparisons, the 6550 is huge, full big punchy bass, crisp detailed highs, seems to be much tighter than the KT88's. I know this is subjective but isn't that what HIFI is all about...I'm having fun with this great amp...
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Old 15th December 2017, 12:30 AM   #14
baileyscot is offline baileyscot  United States
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Default Genalex Upgrade

I just updated my tubes to Genalex. One of my stock 6L6 tubes was having problems and tripping the protection circuit so I took advantage of some black friday shopping deals and finally upgraded. I went with KT-88s and upgraded the 12au7s and 12at7s as well ( I also have the TU-8500 pre-amp). I must say, I feel like I ran the stock tubes too long. I still plan to eventually open up the amp and try the different modes, but immediately I was hearing detail I hadn't heard before and the bass definitely filled in more. I am running some Fostex FE206EN full range back-loaded horns that I built from a Madisound kit. I put on a copy of Wish You Were Here that I had just picked up as a first listen and was blown away by my meager system all over again.
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Old 21st December 2017, 11:58 PM   #15
Mancave62 is offline Mancave62  United States
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I have the TU-8500 as well. Makes for a really nice little system. I found that the kits were a real pleasure to build, great instructions, and parts packaged nicely. Both of mine fired up with no issues. I'm really tempted to build those BLH's from Madisound and compare to my double bass reflex cabinets (I'm not much of a wood worker). I've run strictly in the pentode mode, and haven't had a reason to change since it sounds great to me, and I'm too lazy to take it apart to change the jumper. Try the 6550 tube and compare to the Kt-88, I think I'm liking the 6550 better??
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Old 22nd December 2017, 04:07 AM   #16
Steve Morley is offline Steve Morley  Canada
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Smile Modify the cover to change modes easily

Caveman

Read the 6moons review (link on the vkmusic.ca site on the TU-8200 page), it's a couple of pages into the review. The author describes the mod making two holes in the top cover to facilitate changing output modes.

Making large holes (> 1/4") in sheet metal can be tricky. If you are not comfortable doing this yourself mark the position you want the holes and seek out a local too and die shop. Show them what you want and tell them you'll pay cash. If you pick a standard size (say, 1/2", 5/8", 3/4") the shop can make a clean hole with a standard end mill. They'll even make you a couple of nice covers for the holes out of brass, stainless steel, or whatever you like if you ask nicely.

Cheers, Steve
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