When looking for some 6p14p-ev tubes, some sellers quote different figures for matching. Any of them really meaningful? I need four for the PP amp.
Example one.
Mutual Conductance is:
Tube 1 86
Tube 2 86
Tube 3 85
Tube 4 85
Example two.
Ia S
mA mA/V
1 - 6P14P-EV test results 51.0 13.0
2 - 6P14P-EV test results 51.0 13.0
Example three.
Ia Ig2 S -Ig1
mA mA mA/V uA
1 - 6P14P-EV test results 43.0 4.0 11.0 >0.2
2 - 6P14P-EV test results 43.0 4.0 11.2 >0.2
Tube matching
#1 Tube matching
Last edited by al newall on Tue Dec 28, 2010 9:19 pm, edited 1 time in total.
Much to learn there is.
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#2
I suppose the most meaningful are mu or mA/V, but they're all helpful.
Although IME matched tubes can "drift off" with increasing use.
Although IME matched tubes can "drift off" with increasing use.
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#3
Dunno about anyone else but I'd be inclined to buy 10 for £6.50 and be done with it Al! http://cgi.ebay.co.uk/6n14p-ECC84-6CW7- ... 473wt_1095
DTB
DTB
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#4
Dave.
I see there was a typo in my post, that led you to think i wanted 6n14p.
I corrected it now. Its 6p14p-ev i'm after.
Not that it matters, i see what you are saying.
There's a price to paid for matching.
Also, because this tube is getting popular now, i'm probably better off just buying a job lot.
I thought matching might help, because i find it a bit of a chore balancing the output tubes for equal current.
I see there was a typo in my post, that led you to think i wanted 6n14p.
I corrected it now. Its 6p14p-ev i'm after.
Not that it matters, i see what you are saying.
There's a price to paid for matching.
Also, because this tube is getting popular now, i'm probably better off just buying a job lot.
I thought matching might help, because i find it a bit of a chore balancing the output tubes for equal current.
Much to learn there is.
- Mike H
- Amstrad Tower of Power
- Posts: 20189
- Joined: Sat Oct 04, 2008 5:38 pm
- Location: The Fens
- Contact:
#5
That's the bit I have an issue with. Once had a GEC / Williamson clone running supposedly matched Golden Dragon KT66's with a bias balancing preset. Found I was readjusting it nearly every week.
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
#6
I think part of my problem was not giving the amp sufficient warm up time before setting up.
Trouble is there are 6 hot el84s upside down, directing all their heat at a wooden top plate. It worries me a bit.
Maybe i should think about some removable panels on the top to allow access to the CCS. But what a mither.
Trouble is there are 6 hot el84s upside down, directing all their heat at a wooden top plate. It worries me a bit.
Maybe i should think about some removable panels on the top to allow access to the CCS. But what a mither.
Much to learn there is.
- Mike H
- Amstrad Tower of Power
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- Joined: Sat Oct 04, 2008 5:38 pm
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#7
I would think the EL84's find it a touch on the balmy side as well
Hung upside down by the pins eh?
Hung upside down by the pins eh?
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."