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Millett "Starving Student" hybrid amp - Page 189

post #2821 of 6522
4/1/09 at 4:12pm
Those are fine. In fact, I like them better than the new ceramic stuff.
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post #2822 of 6522
4/1/09 at 7:12pm
Ok cool, because i wasnt sure if the holes would match the pins. NOW I can buy everything lol

thanks
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post #2823 of 6522
4/5/09 at 1:22pm
I've got my hands on one today. Sounds nice, only slight issue is that I get some noise with the Aurvana Live! which has a low impedance of 25 ohm (unfortunately no other dynamic headphones at the moment). Would I still get noise with a ESW10JPN which is 45 ohm?
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post #2824 of 6522
4/5/09 at 10:57pm

Variation to the SS

Hi everyone,

This has been in the works for a while but I finally found some time to put it together. I wanted to modify the starving student amp using an alternative tube to the scarce 19J6's. I finally settled on the 12SR7 and 12SW7 which are only $1 each at vacuumtubes.net. Perfect for the starving student. The caveat is that they are metal tubes and some people may prefer glass tubes. In that case the 12SR7GT is the glass tube version of the 12SR7. It is a few dollars more per tube but still cheap.


Here is the result, the metal starving student:
LL
LL
LL
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post #2825 of 6522
4/5/09 at 10:59pm
If you want to build this version, you have to make some small changes -

R1/R7 - 44k
R5/R11 - 4K
R2/R8 - 330K
R4/R10 - 180K

You will have to use an octal socket, and here are the conversions from the seven pin socket in the original circuit diagram:

1,2 -> 6
5,6 -> 2
3,4 -> 7,8
7->3
Ground pins 4 and 5.

You will also have to ground pin 1 which is for the metal casing. It is probably a good idea to ground pin 1 with a separate path to ground from the heaters (pins 7,8). That way if the ground connection for the heaters breaks for whatever reason you don't see that voltage on the tubes.

Using 2" heatsinks is also recommended since the heaters are running at 12V instead of 19V.
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post #2826 of 6522
4/5/09 at 11:12pm
Nice job Logistic! I know nil about amp designs but it sounds like you've found a solution for alternate tubes -- not sure if you've built an original 19J6 based before, and now curious how this one sound compare to the original?

zk
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post #2827 of 6522
4/5/09 at 11:47pm
I just ordered all the parts to build one of these off Mouser (I found some 19J6's at a local shop, so I have those already) and I decided to go with the Nichicon Muse KW's - I got 1000uF caps to use as both the power caps and the output caps...I think they will be fine on the power end, but is 1000uF too much for the output caps? Would 470uF be a better choice sound-wise?
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post #2828 of 6522
4/5/09 at 11:54pm
Quote:
Originally Posted by penneydude View Post
I just ordered all the parts to build one of these off Mouser (I found some 19J6's at a local shop, so I have those already) and I decided to go with the Nichicon Muse KW's - I got 1000uF caps to use as both the power caps and the output caps...I think they will be fine on the power end, but is 1000uF too much for the output caps? Would 470uF be a better choice sound-wise?
I used the KWs in 1 of my SS builds and I really liked them, although I used 470uF all around. The only thing I can think of is that the larger output caps could possibly give a little more of a turn-off pop than smaller caps would.

Also, to Logistic, that looks like a very interesting build, I do have some octal sockets, extra PSU and chassis so the rest of the parts would be pretty cheap. I'll have to put that one on my to-build list
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post #2829 of 6522
4/6/09 at 12:01am
Quote:
Originally Posted by Coreyk78 View Post
I used the KWs in 1 of my SS builds and I really liked them, although I used 470uF all around. The only thing I can think of is that the larger output caps could possibly give a little more of a turn-off pop than smaller caps would.
Do you think the 1000uF caps would make the amp sound muddier than the 470 uF? Or does adding larger caps not really make that much of a difference?

Good to hear I made a solid choice on the model at least
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post #2830 of 6522
4/6/09 at 12:27am
I found some nice 19J6s for you guys, if you are interested.

http://www.head-fi.org/forums/f42/at...s-sale-418376/
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post #2831 of 6522
4/6/09 at 4:47am
I like what you've done there logistc, very nicely built and good work on converting for tin tubes. I'm curious as to how it sounds compared to a stock SS.
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post #2832 of 6522
4/6/09 at 5:17am
Quote:
Originally Posted by Logistic View Post
Hi everyone,

This has been in the works for a while but I finally found some time to put it together. I wanted to modify the starving student amp using an alternative tube to the scarce 19J6's. I finally settled on the 12SR7 and 12SW7 which are only $1 each at vacuumtubes.net. Perfect for the starving student. The caveat is that they are metal tubes and some people may prefer glass tubes. In that case the 12SR7GT is the glass tube version of the 12SR7. It is a few dollars more per tube but still cheap.


Here is the result, the metal starving student:
I'm curious, what made you decide on this tube?

Cheers
Fred
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post #2833 of 6522
4/6/09 at 5:51am
Was thinking about this, I might rip apart my current iphone speaker system and put a millet starving student inside it

are there any millet starving students with ipod/iphone docks on them yet?
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post #2834 of 6522
4/6/09 at 5:57am
Was thinking about this, I might rip apart my current iphone speaker system and put a millet starving student inside it

are there any millet starving students with ipod/iphone docks on them yet?
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post #2835 of 6522
4/6/09 at 9:52am
Quote:
Originally Posted by GeckoSlayer View Post
are there any millet starving students with ipod/iphone docks on them yet?
Yep
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