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Little Dot MKIII Tube Rolling - Page 11

post #151 of 2785
2/6/08 at 6:29pm
Quote:
Originally Posted by Penchum View Post
Thanks, I'll buy them
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post #152 of 2785
2/6/08 at 6:31pm
Quote:
Originally Posted by pfillion View Post
Thanks, I'll buy them
That seller, is a really great guy. I've conversed with him and purchased his tubes before, and they are always in perfect condition. Fear not.
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post #153 of 2785
2/6/08 at 7:45pm
Quote:
Originally Posted by Penchum View Post
That seller, is a really great guy. I've conversed with him and purchased his tubes before, and they are always in perfect condition. Fear not.
x2. He's got great service and stocks some amazing tubes. Probably the best source for LD tubes on ebay.
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post #154 of 2785
2/6/08 at 10:01pm
I received the Amperex EF92 tubes today in their original boxes. I'm already amazed by these tubes. I just put them in and already I can tell there is more detail at the frequency extremes and for some reason the sound just seems more clear. As if there was a very very light haze with the stock tubes. Also I perceive a little more sparkle to the highs with these tubes. I can't wait till these burn in a bit. Next will be a comparison to the Tung Sol black plates!
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post #155 of 2785
2/6/08 at 10:41pm
Quote:
Originally Posted by golgi View Post
I received the Amperex EF92 tubes today in their original boxes. I'm already amazed by these tubes. I just put them in and already I can tell there is more detail at the frequency extremes and for some reason the sound just seems more clear. As if there was a very very light haze with the stock tubes. Also I perceive a little more sparkle to the highs with these tubes. I can't wait till these burn in a bit. Next will be a comparison to the Tung Sol black plates!
wunderbar, tastes better than the old dog chow.
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post #156 of 2785
2/6/08 at 11:40pm
Thread Starter 
Quote:
Originally Posted by Dept_of_Alchemy View Post
x2. He's got great service and stocks some amazing tubes. Probably the best source for LD tubes on ebay.
Yes, I've bought several tubes from him over the past month or so and he is excellent! I received my Mullard M8161's from him today! About to put them in (if I can figure out how to install the jumper) and burn them in. Will report back once they have some burn in hours on them.
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post #157 of 2785
2/7/08 at 12:00am
Quote:
Originally Posted by RogerB View Post
Yes, I've bought several tubes from him over the past month or so and he is excellent! I received my Mullard M8161's from him today! About to put them in (if I can figure out how to install the jumper) and burn them in. Will report back once they have some burn in hours on them.
Hey Roger! I promise you they are "sweet"!!!
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post #158 of 2785
2/7/08 at 12:16am
Thread Starter 
Geez!!! I just installed the jumpers using needle nose pliers.

Could this possibly be any more difficult???

OK, the M8161's are in place and burn in is about to commence.
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post #159 of 2785
2/7/08 at 12:25am
Quote:
Originally Posted by Penchum View Post
That seller, is a really great guy. I've conversed with him and purchased his tubes before, and they are always in perfect condition. Fear not.
I have just bought the Mullards M8161 from yen1233

My Little Dot MKIII has been released from the customs in Vancouver tonight, it should be in Montreal this Friday.

I just can't wait anymore
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post #160 of 2785
2/7/08 at 12:29am
Quote:
Originally Posted by pfillion View Post
I have just bought the Mullards M8161 from yen1233

My Little Dot MKIII has been released from the customs in Vancouver tonight, it should be in Montreal this Friday.

I just can't wait anymore
That will make for a good weekend, if you can get it on Friday!
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post #161 of 2785
2/7/08 at 12:46am
Roger......Roger.....are you in a daze? Did the M8161's put you into shock? We are all waiting to hear whats going on!
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post #162 of 2785
2/7/08 at 5:33am
Quote:
Originally Posted by Penchum View Post
I'm sorry, my brain if fried! Which heat test? I think I had several yet to do!
The one about whether having tube off the sockets will make the case cooler or not.
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post #163 of 2785
2/7/08 at 9:29am
Quote:
Originally Posted by headcheck View Post
The one about whether having tube off the sockets will make the case cooler or not.
See what I mean! I guess I need your handle! That one is next on my list. I'll try and get at it today.
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post #164 of 2785
2/8/08 at 12:37am
Quote:
Originally Posted by headcheck View Post
The one about whether having tube off the sockets will make the case cooler or not.
RESULTS ARE IN:

I used my MKII, with Russian Power tubes and Russian EF95 Driver tubes. Room temperature was 70 degrees F, and from a cold start, ran the amp for two hours with tubes down, took measurements, then cooled off, then two hours with tubes up approximately 2-3mm and took measurements. Here are the results:

Tubes down tight:

Amp Housing: 110F
Amp Face: 103F
Amp Top Plate: 128F
XFormer Housing: 130F
Rear Tubes: 230F
Front Tubes: 140F

Tubes 2-3mm raised in socket:

Amp Housing: 110F
Amp Face: 98F
Amp Top Plate: 124F
XFormer Housing: 130F
Rear Tubes: 230F
Front Tubes: 140F

As you can see, there were slight temperature drops on the top plate and face plate, but only 4-5 degrees F. Not enough to really warrant the risk of having exposed pins IMHO. What this little test does show, is that the heat dissipation is constant over time. This will result in longer life for the amp. The new design (internal) lends itself to spreading the heat out over the housing better, and this makes the dissipation of that heat more efficient.
This MKII continues to impress me every time I do something new with it!
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post #165 of 2785
2/8/08 at 5:11am
Quote:
Originally Posted by Penchum View Post
RESULTS ARE IN:

I used my MKII, with Russian Power tubes and Russian EF95 Driver tubes. Room temperature was 70 degrees F, and from a cold start, ran the amp for two hours with tubes down, took measurements, then cooled off, then two hours with tubes up approximately 2-3mm and took measurements. Here are the results:

Tubes down tight:

Amp Housing: 110F
Amp Face: 103F
Amp Top Plate: 128F
XFormer Housing: 130F
Rear Tubes: 230F
Front Tubes: 140F

Tubes 2-3mm raised in socket:

Amp Housing: 110F
Amp Face: 98F
Amp Top Plate: 124F
XFormer Housing: 130F
Rear Tubes: 230F
Front Tubes: 140F

As you can see, there were slight temperature drops on the top plate and face plate, but only 4-5 degrees F. Not enough to really warrant the risk of having exposed pins IMHO. What this little test does show, is that the heat dissipation is constant over time. This will result in longer life for the amp. The new design (internal) lends itself to spreading the heat out over the housing better, and this makes the dissipation of that heat more efficient.
This MKII continues to impress me every time I do something new with it!
So my fingers where right after all: Thats very reassuring to know the tubes are not affected sitting up. Sound is still as sweet as ever too. As an Aussie would say: Love ya work!!
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