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Offline Paul Birkeland

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Reply #15 on: November 15, 2013, 01:10:28 PM
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« Last Edit: November 16, 2013, 02:59:13 PM by Caucasian Blackplate »

Paul "PB" Birkeland

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Offline Natural Sound

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Reply #16 on: November 16, 2013, 01:37:22 PM
Crack I have with $3000 in upgrades and its alright, but not great. Mainline intrigues me...but I am talking amps I can buy assembled

I don't mean to be a wise a$$ but maybe some of those "upgrades" made your amp, "not great." Sometimes trying to substitute parts can harm performance. Trust me, I've been there, done that. Never tried a $60 fuse though. I'll have to look into that.

 



audiophileboss

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Reply #17 on: November 16, 2013, 02:08:36 PM
Oh yeah, how could I forget the $100 12au7 and $200 6080.



Offline Mike B

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Reply #18 on: November 16, 2013, 04:19:13 PM
All that dough and you still got this nasty "left hum"

Amazing.  High dollar tubes, interconnects, power cables, pots and whatever else you could drop a lotta bucks on and you still got that nasty hum.

Bummer dude.

Give it up baby, it's time to go.  Pay someone who knows what they are doing to build your stuff or just buy some more high dollar stuff that comes assembled inna box.  Then you can add your usual 3 grand of wires to it and wax in the glory.

Really.  You added 3 grand to a 3 hundred dollar kit and it sounds worse than a stocker.  Quit.

Far away from the bleeding edge


audiophileboss

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Reply #19 on: November 17, 2013, 03:16:56 AM
No dude, your wrong. Sounds way better, but it has a hum. I will figure it out.



Offline corndog71

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Reply #20 on: November 17, 2013, 05:03:12 AM
No dude, your wrong. Sounds way better, but it has a hum. I will figure it out.

Most likely you are missing or have a loose connection or it's not grounded properly.  It could also be picking up magnetic fields from other equipment nearby.

The world was made for those not cursed with self-awareness.

Rob


Offline dubiousmike

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Reply #21 on: November 17, 2013, 09:44:00 AM
Quite possibly one of your nos tubes.  Have you tried reverting to the stock tubes?

Mike M.


audiophileboss

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Reply #22 on: November 17, 2013, 01:08:35 PM
No I havnt, and I cant I threw them away. Maybe I will buy a mew tube and try it out



Offline dubiousmike

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Reply #23 on: November 17, 2013, 03:48:04 PM
Yeah - that's where I'd put my money if I were betting.  If you have any deoxit on hand, try that on the pins.  If not, and they look oxidized at all, you can also try sanding the pins or repeatedly inserting/pulling them as a means of cleaning them off.  Folks recommended that I do this a year or so back with a 1950's rca blackplate 12bh7 I had that was humming.  It solved the problem.

FWIW, my finding has been that price is definitely not a guarantee of a great tube.  My favorite input tube at present in my crack is basic tung sol 12au7 that I bought for about $10.  I periodically  compare it to pricier mullards, amperex and rca's sitting in my closet, and keep coming back to the tung sol.  Picking up a bunch of cheapies on ebay is, imo, a better way of finding one you really like than dropping a bill on a single 12au7.   

Mike M.


Offline Chris

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Reply #24 on: November 19, 2013, 10:12:11 AM
Is that an  NOS tung sol or the new production ones?