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Little Dot MKIII Tube Rolling - Page 9

post #121 of 2785
2/4/08 at 8:40am
Yeah, just to clarify. If your Little Dot amp isn't the MkIVse especially wired for the 5687/E182CC family of power tubes (ie. if you have an MkII or MkIII or regular MkIV) then the only power tubes you can use are the 6H6N Russian ones.
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post #122 of 2785
2/4/08 at 8:55am
Quote:
Originally Posted by Dept_of_Alchemy View Post
Yeah, just to clarify. If your Little Dot amp isn't the MkIVse especially wired for the 5687/E182CC family of power tubes (ie. if you have an MkII or MkIII or regular MkIV) then the only power tubes you can use are the 6H6N Russian ones.
Now the million dollar question. Can the mod on the MkIVse be done DIY on the Mk3?
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post #123 of 2785
2/4/08 at 9:11am
Quote:
Originally Posted by headcheck View Post
Now the million dollar question. Can the mod on the MkIVse be done DIY on the Mk3?
Better ask DavidZ or Mr.Yang that question. There may be reasons from his design stand point that none of us would know for sure.
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post #124 of 2785
2/4/08 at 12:28pm
Quote:
Originally Posted by Penchum View Post
Better ask DavidZ or Mr.Yang that question. There may be reasons from his design stand point that none of us would know for sure.
Sword did post a rewire diagram on the Littledot forum on this topic.

Here it is:


Viewing a thread - 6N6P-I equivalents in LD mkIII?

You need to sign-in to view the illustrations.
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post #125 of 2785
2/4/08 at 12:43pm
As to rewiring on the board, I personally wouldn't go that far to investigate power tube varieties. But here's a thought:

Buy two new tube sockets (four total), do a pin to pin reconfiguration between them, glue the assembly together separated by a piece of plexi tubing... - Homemade tube adapters!
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post #126 of 2785
2/4/08 at 5:27pm
Quote:
Originally Posted by ethebull View Post
As to rewiring on the board, I personally wouldn't go that far to investigate power tube varieties. But here's a thought:

Buy two new tube sockets (four total), do a pin to pin reconfiguration between them, glue the assembly together separated by a piece of plexi tubing... - Homemade tube adaptors!
Do you think that could be done and withstand high temps? An adapter would be cool...turn the whole issue into a plug and play situation... hummmmm.
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post #127 of 2785
2/4/08 at 5:31pm
Quote:
Originally Posted by Penchum View Post
Do you think that could be done and withstand high temps? An adapter would be cool...turn the whole issue into a plug and play situation... hummmmm.
It would take some looking into. I'm sure there are materials choices that would hold up. Just thought I'd throw it out there.
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post #128 of 2785
2/4/08 at 6:53pm
Quote:
Originally Posted by Penchum View Post
Do you think that could be done and withstand high temps? An adapter would be cool...turn the whole issue into a plug and play situation... hummmmm.
Quote:
Originally Posted by ethebull View Post
It would take some looking into. I'm sure there are materials choices that would hold up. Just thought I'd throw it out there.
DoA, what do you think? Is this possible?
Thanks!
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post #129 of 2785
2/4/08 at 7:20pm
Quote:
Originally Posted by Penchum View Post
DoA, what do you think? Is this possible?
Thanks!
I've looked at some photos on line of various 9-pin socket types. The stack idea probably wouldn't work. The bottoms of sockets are not like the bottoms of tubes. However, if you soldered wired pins to the bottom of a loose socket, they could be repositioned to the desired pin arrangement. Then you'd have to figure out a way to anchor the pins into a plug-able adapter unit that would be fashioned into a one piece unit with the adapter socket. It would take some considerable fetutsing around... unless something like this already exists?
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post #130 of 2785
2/4/08 at 7:22pm
Quote:
Originally Posted by Penchum View Post
DoA, what do you think? Is this possible?
Thanks!
It should be possible, the specs on the power tubes (6N6Pi and 5687) are close enough that they can be considered identical tubes with different pin outs. The temperature isn't really an issue being that the components inside the amp are rated to 85 degrees C while the plastics used in tube sockets and tube dampeners are usually rated to at least 250F (or 120C).

Anyway, here's a rewiring diagram for those who want to build an adepter:


^Credit: SwordYang of LD
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post #131 of 2785
2/4/08 at 7:24pm
Quote:
Originally Posted by ethebull View Post
I've looked at some photos on line of various 9-pin socket types. The stack idea probably wouldn't work. The bottoms of sockets are not like the bottoms of tubes. However, if you soldered wired pins to the bottom of a loose socket, they could be repositioned to the desired pin arrangement. Then you'd have to figure out a way to anchor the pins in a plug-able adapter unit that would be fasioned into a one piece unit with the adapter socket. It would take some considerable fetutsing around... unless something like this already exists?
As far as I know, Mikhail of Single Power makes some adeptors for his own amps, so it CAN be done.
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post #132 of 2785
2/4/08 at 7:32pm
Quote:
Originally Posted by Tech2 View Post
In the meantime, I'll continue watching ebay to see if he lists any more.
Buy these...

RUSS TUBES 6N6P-I = ECC89 = E182CC Lot of 10. NEW! RARE - eBay (item 260208610618 end time Feb-08-08 14:38:02 PST)

...and put me down for a pair if you think about selling them. My current ones have remnants of burnt sennheiser pads on them
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post #133 of 2785
2/4/08 at 7:43pm
Quote:
Originally Posted by robbmcaulay View Post
Buy these...

RUSS TUBES 6N6P-I = ECC89 = E182CC Lot of 10. NEW! RARE - eBay (item 260208610618 end time Feb-08-08 14:38:02 PST)

...and put me down for a pair if you think about selling them. My current ones have remnants of burnt sennheiser pads on them
Ah yes, the seller that I keep posting. They are the standard type. But next time I buy power tubes, they will be 5687/E182CC 's, once an adpater solution is at hand.
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post #134 of 2785
2/4/08 at 8:58pm
I realised it was the same guy, but he said he was looking out for a new listing.

So... can I buy your old stock ones when you have an adapter?
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post #135 of 2785
2/4/08 at 10:13pm
Quote:
Originally Posted by Dept_of_Alchemy View Post
As far as I know, Mikhail of Single Power makes some adeptors for his own amps, so it CAN be done.
I really open a can of worms with this haven't I. If its is possible then there will be some MK3 that will put a Mk4se to shame.
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