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Little Dot MKIII Tube Rolling - Page 39

post #571 of 2870
Will these work as power tube upgrades? I'm a little confused on the nomenclature...

JJ ECC99 Preamp Tube 12AU7 Type NEW !! - eBay (item 200200320877 end time Apr-14-08 12:32:48 PDT)
post #572 of 2870
Quote:
Originally Posted by oatmeal769 View Post
Will these work as power tube upgrades? I'm a little confused on the nomenclature...

JJ ECC99 Preamp Tube 12AU7 Type NEW !! - eBay (item 200200320877 end time Apr-14-08 12:32:48 PDT)

I don't think those are compatible.12AU7 are driver/pre-amp section tubes for the most part. No amp I've come across uses this type (12AU7 or equivalent) as a power tube, then again I could be wrong.

Only 6N6P(6H6P) 6N6PI & 6H6PI AFAIK for the MK III. Build some "Bulldapters" and your options expand considerably. Change grid resistor from 60 (or is it 68 ? I forget) ohm to 120 ohm and you can (only) run 6H30P series.

Regards,

Peete.

MK III owner
post #573 of 2870
Quote:
Originally Posted by Penchum View Post
Also, if your HD-650's are new, they too need several hundred hours before they "open up". Hang in there, be patient with your new gear and do those hours. The difference between start and finish is almost startling!
Hey Pench.....define several...as in 3-500 hrs or 2-300 hrs....or 600 hrs + ?

I'm still pluggin' away at my 650's (figure about 185 hrs so far). On another note I finished up the Pink Floyd cap and diode mod on my X-10 V3 and what a difference that has made between the prelude card and the MK III. I scored some NOS Sylvania 6112's from the early 70's for good measure and added PIO bypass caps to the output stage........again with the burn in crappola ...seems like I'm doing nuthin' but burnin' in gear the last 3 weeks with no end in sight

Regards,


Peete.
post #574 of 2870
Quote:
Originally Posted by Pricklely Peete View Post
Only 6N6P(6H6P) 6N6PI & 6H6PI AFAIK for the MK III. Build some "Bulldapters" and your options expand considerably. Change grid resistor from 60 (or is it 68 ? I forget) ohm to 120 ohm and you can (only) run 6H30P series.
Ahh - Thanks for those numbers. Any recommendations? I've seen the Electro-Harmonix ones, but they're pretty pricey. I hear power tubes don't make as big a difference, but like I've said, I'd rather just burn in a premium set of tubes from the get-go.
post #575 of 2870
Quote:
Originally Posted by oatmeal769 View Post
Ahh - Thanks for those numbers. Any recommendations? I've seen the Electro-Harmonix ones, but they're pretty pricey. I hear power tubes don't make as big a difference, but like I've said, I'd rather just burn in a premium set of tubes from the get-go.

Well, once you've changed the grid resistors there are three levels of 6H30. There is the regular 6H30P, the EH 6H30P gold, and the uber expensive 6H30P DR's. Pench has the latter 2. The gold's are the sweet spot money wise while the DR's are 200 bones for a matched pair from tube depot. You might be able to find a used pair for less although I haven't searched for them so I don't really know if they are numerous or not. I somehow doubt there are many DR's out there.

The Bulldapters are an interesting way to go as well. Loads of NOS glass can had going that route. Ask Ethebull and Pench for details on tube types you can use with the aforementioned Bulldapters.

Listening to some Pink Floyd right now......ahhhhhh....... Hope this helps you Oatmealer

Regards,

Peete.
post #576 of 2870
Quote:
Originally Posted by Pricklely Peete View Post
Well, once you've changed the grid resistors there are three levels of 6H30. There is the regular 6H30P, the EH 6H30P gold, and the uber expensive 6H30P DR's. Pench has the latter 2. The gold's are the sweet spot money wise while the DR's are 200 bones for a matched pair from tube depot. You might be able to find a used pair for less although I haven't searched for them so I don't really know if they are numerous or not. I somehow doubt there are many DR's out there.

The Bulldapters are an interesting way to go as well. Loads of NOS glass can had going that route. Ask Ethebull and Pench for details on tube types you can use with the aforementioned Bulldapters.

Listening to some Pink Floyd right now......ahhhhhh....... Hope this helps you Oatmealer
MAJOR old Floyd fan here too. Is the difference worth the money? I'm reading this as:
Break mine in with my NOS Tung-Sol's in the driver section, leave the stock power tubes alone for now.
post #577 of 2870
I just thought I'd add another point about the stock tubes if you decide to stick with them. Be sure to get 6N6P tubes made from the Novosibirsk plant. They are cheap, well made and sound very good. Mine (I have 6 sets) are from the early 70's. Novosibirsk (spelling ?) have a pentagon symbol on the cardboard sleeves along with a radio tower. Most of the vendors of this type of tube are in the Ukraine or the Russian Federation. I ordered mine from a cat in the Ukraine. Took same amount of time to get as tubes from Yen Audio in USA. I'm in Toronto GTA region in Ontario so go figure
post #578 of 2870
Actually I'd break in the amp with the stock tubes for 75 hours first then the last 50 use the Tung Sols. 40's era Tung Sols are getting scarce (that are really in NOS condition, most are used or pulls that test "good"). Something to keep in mind.

I have a set of Tung Sol 403B's and Sylvania 6AK5's from the 50's waiting on my HD650's to get broken in. I'm using a set of dirt cheap Russian driver tubes ( the ones Pench and E raved about ) along with the stock power tubes to use for break in purposes. Saving the good stuff for when it counts. That's just me though, I'm cheap

I would kill for master tapes of Wish You Here, Animals, Meddle, oh hell the whole damn library
post #579 of 2870
I forgot to answer your question about power tube differences. I'd describe the stock 6N6P tube as a EL34 type and the 6H30P more like a KT88 if that helps. The KT88 being known for a tighter more extended response, especially in the bass region and the EL34 more relaxed but with that beautiful midrange we all crave.


Cripes I'm piling up the posts tonight
post #580 of 2870
Quote:
Originally Posted by Pricklely Peete View Post
Actually I'd break in the amp with the stock tubes for 75 hours first then the last 50 use the Tung Sols. 40's era Tung Sols are getting scarce (that are really in NOS condition, most are used or pulls that test "good"). Something to keep in mind.

I have a set of Tung Sol 403B's and Sylvania 6AK5's from the 50's waiting on my HD650's to get broken in. I'm using a set of dirt cheap Russian driver tubes ( the ones Pench and E raved about ) along with the stock power tubes to use for break in purposes. Saving the good stuff for when it counts. That's just me though, I'm cheap

I would kill for master tapes of Wish You Here, Animals, Meddle, oh hell the whole damn library
That's actually a great idea. I can even use the tung's when listening during break-in.
Check these out, do they look like the real deal? They do to me, but I'm not a major expert.

Tung-sol 6AK5 Matched Pair Little Dot MkII MkIII MkIV - eBay (item 290215068792 end time Mar-23-08 15:56:10 PDT)

It's just stupid how well those albums were recorded 35 years ago. Although not their biggest 'hit', Animals is a perennial favorite.
post #581 of 2870
Congrats on the score....great price. Side getters on those...interesting. I'm no expert on anything but for that price you can't go wrong.

Looks like the real deal...remind me of 12AU7 RCA clear tops. I'll bet dollars to donuts those tubes sound amazing

Quite the find Oatmeal !!!

Regards,

Peete.

PS, I'm hitting the sack Jack......1:30 am here....
post #582 of 2870
Quote:
Originally Posted by Pricklely Peete View Post
Congrats on the score....great price. Side getters on those...interesting. I'm no expert on anything but for that price you can't go wrong.

Looks like the real deal...remind me of 12AU7 RCA clear tops. I'll bet dollars to donuts those tubes sound amazing

Quite the find Oatmeal !!!

Regards,

Peete.

PS, I'm hitting the sack Jack......1:30 am here....
Yeah, I was pretty excited.
Check these out. I've seen literature that says these are equivalent to the stock 6H6PI, but I've also seen contradictory stuff too...

6CG7 / 6FQ7 Tube Types

PS, I was asleep by then!
post #583 of 2870
Yeah, the side getter thing is cool. That's one of the things that makes me think these are seriously old skool. Like they were made before they figured out how to do it vertically...
post #584 of 2870
Quote:
Originally Posted by Pricklely Peete View Post
Hey Pench.....define several...as in 3-500 hrs or 2-300 hrs....or 600 hrs + ?

I'm still pluggin' away at my 650's (figure about 185 hrs so far). On another note I finished up the Pink Floyd cap and diode mod on my X-10 V3 and what a difference that has made between the prelude card and the MK III. I scored some NOS Sylvania 6112's from the early 70's for good measure and added PIO bypass caps to the output stage........again with the burn in crappola ...seems like I'm doing nuthin' but burnin' in gear the last 3 weeks with no end in sight

Regards,


Peete.
Howdy!!

When I burned-in my HD-650s, they took almost 450 hours before I couldn't detect any further changes. When I bought my wife her HD-650s for Xmas, they took only 300 hours. I'm guessing that each set is slightly different than the next. If I were you, I would put in the best tubes I have and just enjoy the heck out of them for the next month or so. Eventually, you won't be able to detect any further changes, and you'll be done. Might as well enjoy them now.
post #585 of 2870
Penchum -
Do you know if these are a possibility for power tubes? They are cheap and abundant : )
6CG7 / 6FQ7 Tube Types
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