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Cavalli Compact Tube Hybrid (CTH) Tube & Tweak thread. - Page 9

post #121 of 672
5/22/09 at 1:26am
looking at the board, top down. DC to the right. knob to the right. Look at the right edge of the board, towards the upper side. Find the regulator, only other TO-220 device there other than the 24V reg. The 24V reg will be heatsinked. The switcher usually isn't. Next to the switcher is a big tombstoned diode. Next to that is a 47uF/50V cap. It sits between the diode and the switcher, in a right angle formation.

Replace it with this.

UPW1H331MPD

If you've got room (and it looks like you do), replace it with this.

UPW1H331MPD6

or

http://search.digikey.com/scripts/Dk...name=P12399-ND

Note the cap dimensions.

Edit:

http://www.head-fi.org/forums/f6/ver...ml#post5683303
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post #122 of 672
5/22/09 at 4:45am
Don't you have to change the coils aswell? Or are these still ok for the 6n6p's current draw? Planning on doing the same thing
Ava
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post #123 of 672
5/22/09 at 10:31am
Thread Starter 
Quote:
Originally Posted by Ynis Avalach View Post
Don't you have to change the coils as well? Or are these still ok for the 6n6p's current draw? Planning on doing the same thing
Ava
holland had this to say.

I'm conflicted about pushing higher heater loads in the CTH. We've achieved quite a lot in a 3"x5" space. Perhaps as much as feasible in that space for an amp w/its features given single PCB, through-hole, etc. OTOH why not find its limits

With tweaks like holland & others are trying to get heater -> 1A, although perhaps not audible in CTH, I think switchers get a bit "ugly" at or near their rated limits. The LM2595 (1A) does have a 3A cousin - the LM2596. Didn't check pinout & likely requires different values for surrounding components, but something major tweakers (like those that add NOS to their cars) might want to consider.
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post #124 of 672
5/22/09 at 10:56am
Quote:
Originally Posted by Ynis Avalach View Post
Don't you have to change the coils aswell? Or are these still ok for the 6n6p's current draw? Planning on doing the same thing
Ava
I have been using a 6N6P in my CTH regularly with standard coils without any problems.
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post #125 of 672
5/22/09 at 11:08am
Quote:
Originally Posted by Forte View Post
I have been using a 6N6P in my CTH regularly with standard coils without any problems.
Well if there is no need for this,perfect! Thank you! Ava
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post #126 of 672
5/22/09 at 12:07pm
Anyway, would a 1.25A toroid be sufficiant for this 1A upgrade? Ava
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post #127 of 672
5/22/09 at 12:13pm
So, I get the bad feeling that all these cheap and cheerful tubes are going to go up in price if the CTH catches on, better get them while they are a steal..

Like O'l Blue Eyes said: Tubes are the Crack Cocaine of the HeadFi world..
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post #128 of 672
5/22/09 at 12:37pm
I have so much Crack Cocaine that it makes me wanna keep my amp even when I see something id like to try, thus my interest in the CTH. I think I have spend about 600 on tubes so far and all I can use is about 70 dollars worth at one time.
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post #129 of 672
5/22/09 at 5:15pm
Quote:
Originally Posted by cfcubed View Post
I think switchers get a bit "ugly" at or near their rated limits. The LM2595 (1A) does have a 3A cousin - the LM2596. Didn't check pinout & likely requires different values for surrounding components, but something major tweakers (like those that add NOS to their cars) might want to consider.
Indeed. I will try to find out for sure. The sucker runs hot with the 6N6P-i, for sure. I will likely not use it, due to heat and fall back to 600mA tubes....though wiatrob at one point said his 6H30-DR is his favorite in the CTH. I haven't had the luxury to try that yet.

speaking of the NOS analogy. SOHA II...my current mod for it (in planning with parts ordered) is a 240V B+. Woo, big step up from the 100V B+ in terms of voltage. Will it sound better? I haven't a clue, but it's fun to get there.

I can't let all these "stacker" guys have the fun with HV hybrids.

Edit: forgot to comment on the LM2596. It should work with the stock values, if drawing the same current loads as stock. @ 3A, I'm sure some caps will pop from the heat on the CTH. 6N6P-i runs hot on my build, just from proximity to the tube.
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post #130 of 672
5/22/09 at 6:31pm
Quote:
Originally Posted by holland View Post
speaking of the NOS analogy. SOHA II...my current mod for it (in planning with parts ordered) is a 240V B+. Woo, big step up from the 100V B+ in terms of voltage. Will it sound better? I haven't a clue, but it's fun to get there.
I run the original preprototypethatfailedtobeprototyped soha ii at 200V, not necessary but i could so i did , not convinced it sounds any better than it did at 90V. Do let us know if you feel it makes a difference.

Quote:
Originally Posted by holland View Post
I can't let all these "stacker" guys have the fun with HV hybrids.
tut tut

i guess i am threadjacking again - need to build a CTH and get in on the fun ..dB
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post #131 of 672
5/22/09 at 6:40pm
Thread Starter 
Quote:
Originally Posted by holland View Post
speaking of the NOS analogy. SOHA II...my current mod for it (in planning with parts ordered) is a 240V B+. Woo, big step up from the 100V B+ in terms of voltage. Will it sound better? I haven't a clue, but it's fun to get there.
Know what you mean... I didn't use 250v rated caps in the HV CTH PTP proto:

for nothing SRPP came up for a day or so way back when lots of possibilities were flowing. Thinking it needs at least 200v B+. I've not forgotten that
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post #132 of 672
5/25/09 at 1:20pm
Quote:
Originally Posted by olblueyez View Post
I have so much Crack Cocaine that it makes me wanna keep my amp even when I see something id like to try, thus my interest in the CTH. I think I have spend about 600 on tubes so far and all I can use is about 70 dollars worth at one time.
I wrote to an eBay seller and found out he lives less than 2 miles away from where I live (a really bad sign for my wallet). We spoke shortly on the phone and gave an impression that he has a large variety of NOS stashed in his basement. In fact, if I needed a specific tube I would have to help go through his bunch, although he has them categorized in size, no. pins, p/n, etc.

Since I’m not familiar with tube brands/models and their variants (let alone their sound quality), I wonder if I can get some help in spotting a few decent (better than average) tubes just by looking at his short listing. He mentions if the tubes I needed do not appear in his store list doesn’t mean he doesn’t have it.

I already plan to hunt down for some 8416 gold pins to start a small tube collection. cheers.

Scotts Vintage (eBay)
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post #133 of 672
5/25/09 at 1:27pm
Quote:
Originally Posted by zkool448 View Post
I wrote to an eBay seller and found out he lives less than 2 miles away from where I live (a really bad sign for my wallet). We spoke shortly on the phone and gave an impression that he has a large variety of NOS stashed in his basement. In fact, if I needed a specific tube I would have to help go through his bunch, although he has them categorized in size, no. pins, p/n, etc.

Since I’m not familiar with tube brands/models and their variants (let alone their sound quality), I wonder if I can get some help in spotting a few decent (better than average) tubes just by looking at his short listing. He mentions if the tubes I needed do not appear in his store list doesn’t mean he doesn’t have it.

I already plan to hunt down for some 8416 gold pins to start a small tube collection. cheers.

Scotts Vintage (eBay)
You should certainly pick up the 12BH7A's...
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post #134 of 672
5/27/09 at 1:05am
yea, I would try those 12bh7 dont know much the other tubes. His ebay page has a horrible background cant read the words.
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post #135 of 672
5/27/09 at 1:26am
Forget all those other tubes - http://www.head-fi.org/forums/f5/rap...6/#post5713263
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