Sound Quality Vs. Measurements - Page 790

AndrewT · 24th December 2012, 11:30 AM

Quote:

Originally Posted by dvv

...................... I think MJE 15030/15031 is all one could ever wish for. Very well behaved, good beta, all of 8 Amp current capability, 140V, 30 MHz, what else is there?.............

mje15034/5

Most amplifiers don't need and can't use the 4A dc current rating. So it has plenty current capability for driver duty. It's faster and higher gain.
Does it have lower Cob? I can't remember and have never measured them.

nigel pearson · 24th December 2012, 12:09 PM

I think D44/45 also for booster duty . BD 139/140 MJE 340/350 . Some don't like the latter . I have had good results and often need 250 V + .

dvv · 24th December 2012, 01:34 PM

Quote:

Originally Posted by AndrewT

mje15034/5

Most amplifiers don't need and can't use the 4A dc current rating. So it has plenty current capability for driver duty. It's faster and higher gain.
Does it have lower Cob? I can't remember and have never measured them.

Fankly Andrew, I don't see from the data sheets just how is '34 "better", "faster", etc than the '30, except by the fact that it has a higher voltage rating?

Both have voltage ratings far in excess of what is required for a line amp transistor.

a.wayne · 24th December 2012, 04:39 PM

Well i need 20 amps per channel , so out they go ...

Hey i have a Bat Vk-3 pre in need of a magic volume control cleaning or a new one , any word on VC cleaners , if not i will yank this one for a new expensive time consuming pot install ...

gootee · 24th December 2012, 05:41 PM

Home of DeoxIT and HAND-E-GLOVE - CAIG Laboratories, Inc.

dvv · 24th December 2012, 07:19 PM

Or, you can use the concotion service gents use. It only assumes the pot is not encapsulated, but then, if it is, nothing will work.

You need one empty little bottle for eye or nose drops, one with which you can drop only one drop somewhere. Open it up, wash it with water and let it dry.

Buy some vaseline in your local drug store and some medicinal alcohol. Put some vaseline, about your small finger half nail amount, into the bottle you washed. Put in about an equal amount of medicinal alcohol, Close and shake for about 10 minutes or so. The result will be a goo which just a bit more liquid than jelly.

Turn pot to one side and drop just one drop, let it find its way in. Then turn the pot to the maximum opposite position and drop in another single drop. Move the pot slowly from one extreme to the next for about a minute. Pause for a minute, then repeat the moving for another minute.

I guarantee that pot will not do anything it's not supposed to do for the next 3 years at least.

NOTE: Under no circumstances use gasolime and/or petrol instead of the medicinal alcohol, beuase they have a high content of oil which you definitely do NOT want.

a.wayne · 25th December 2012, 02:00 AM

Well i have some 150proof white rum, medicinal to some .....

Merry xmas Gents ......

dvv · 25th December 2012, 06:37 AM

Quote:

Originally Posted by a.wayne

Well i have some 150proof white rum, medicinal to some .....

Merry xmas Gents ......

Could be the salvation of your pot, Wayne.

M Gregg · 08:31 PM

servisol,

SERVISOL SUPER 10 SWITCH AND CONTACT CLEANER - FREE P&P | eBay

As usual use at your own risk..however I have had great results..

If you want to kill your pot use WD40...its almost guaranteed to make it as unusable as possible...(Dirt Magnet)

I have even seen people drill a small hole 1mm in an encapsulated pot and use servisol...Why..because if its coming out then there is nothing to lose..guess what it worked..

Regards
M. Gregg

nigel pearson · 29th December 2012, 09:35 PM

WD 40 is very good for Quad 33 switches . Jeff Popple of Quad recommended it . He said they started using it by accident when no switch cleaner was available . I used it on my 33 many years ago and it has been trouble free ever since . I do suspect it is superior for that , Jeff thought so .

Happy New Year when it comes . Took my friend out to lunch on the 20 th , wanted to be certain it was before the end of the world . Fox Inn Ardley Oxon . Time Warp on steroids .

24th December 2012, 07:19 PM	#7896
dvv diyAudio Member Join Date: Sep 2004 Location: Belgrade, Serbia	Or, you can use the concotion service gents use. It only assumes the pot is not encapsulated, but then, if it is, nothing will work. You need one empty little bottle for eye or nose drops, one with which you can drop only one drop somewhere. Open it up, wash it with water and let it dry. Buy some vaseline in your local drug store and some medicinal alcohol. Put some vaseline, about your small finger half nail amount, into the bottle you washed. Put in about an equal amount of medicinal alcohol, Close and shake for about 10 minutes or so. The result will be a goo which just a bit more liquid than jelly. Turn pot to one side and drop just one drop, let it find its way in. Then turn the pot to the maximum opposite position and drop in another single drop. Move the pot slowly from one extreme to the next for about a minute. Pause for a minute, then repeat the moving for another minute. I guarantee that pot will not do anything it's not supposed to do for the next 3 years at least. NOTE: Under no circumstances use gasolime and/or petrol instead of the medicinal alcohol, beuase they have a high content of oil which you definitely do NOT want. __________________ Such is life, baby! Ета жизњ, бејби!

28th December 2012, 08:18 PM	#7899
M Gregg diyAudio Member Join Date: Jun 2010 Location: UK	servisol, SERVISOL SUPER 10 SWITCH AND CONTACT CLEANER - FREE P&P \| eBay As usual use at your own risk..however I have had great results.. If you want to kill your pot use WD40...its almost guaranteed to make it as unusable as possible...(Dirt Magnet) I have even seen people drill a small hole 1mm in an encapsulated pot and use servisol...Why..because if its coming out then there is nothing to lose..guess what it worked.. Regards M. Gregg __________________ What is the sound of one hand clapping? Last edited by M Gregg; 28th December 2012 at 08:31 PM.

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24th December 2012, 12:09 PM	#7892
nigel pearson diyAudio Member Join Date: Mar 2007 Location: Oxfordshire	I think D44/45 also for booster duty . BD 139/140 MJE 340/350 . Some don't like the latter . I have had good results and often need 250 V + .

24th December 2012, 04:39 PM	#7894
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	Well i need 20 amps per channel , so out they go ... Hey i have a Bat Vk-3 pre in need of a magic volume control cleaning or a new one , any word on VC cleaners , if not i will yank this one for a new expensive time consuming pot install ...

24th December 2012, 05:41 PM	#7895
gootee diyAudio Member Join Date: Nov 2006 Location: Indiana Blog Entries: 1	Home of DeoxIT and HAND-E-GLOVE - CAIG Laboratories, Inc.

25th December 2012, 02:00 AM	#7897
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	Well i have some 150proof white rum, medicinal to some ..... Merry xmas Gents ......

29th December 2012, 09:35 PM	#7900
nigel pearson diyAudio Member Join Date: Mar 2007 Location: Oxfordshire	WD 40 is very good for Quad 33 switches . Jeff Popple of Quad recommended it . He said they started using it by accident when no switch cleaner was available . I used it on my 33 many years ago and it has been trouble free ever since . I do suspect it is superior for that , Jeff thought so . Happy New Year when it comes . Took my friend out to lunch on the 20 th , wanted to be certain it was before the end of the world . Fox Inn Ardley Oxon . Time Warp on steroids .