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Shootout of Nos 6sn7 tubes

I will have shootout between TS BGRP, RCA vt231, KR vt231, Syl vt231, Raytheon vt 231 and "Bad boy" next weekend.

If I get MELZ 6N8S 6SN7 Metal Base next week, then I will also include it in shootout


RCA5691, Psavne Acme 300B, Psavne Acme 805 are also being used in Line Magnetic 508 amplifier.

Speaker will be Lansche 4.1 with plasma tweeter.

Digital source will be Dave and HMS fed by ripped CD stored in ssd drive of Cocktail audio x30.


I will play

Eva Cassidy's 'Autumn Leaves"

"Trinity Sessionn " by Cowboy Junkies

For classical orchestra, "Trittico" directed by Fennel.

"Still harry after all these years" will be for fusion jazz.

Any more suggestion gentlemen and ladies.

Thomas
128x128shkong78
lowrider57's avatar
lowrider57
5,417 posts
 
I'm going to contact the seller tonight. I received my second pair of 1980's, so I'll have a listen to them.

Did that high frequency noise go away? Which tube was it?

shkong78's avatar
shkong78 OP
1,485 posts
 
@lowrider57 

i remember hearing noise tube made in 83 ( that I got from Audiomart) but not from tubes made in 80( Russian and Ebay).

As I had played 6n8s tube for few days, I had not been playing 1578 for a while.
testpilot
949 posts
 
Melz quality controlled started to suffer in the 80’s.  If you want the best Melz 1578 look for a pair manufactured in the mid 70’s.  The hole plates construction is slightly different than tubes manufactured in the 80’s.  The 70’s 1578 do not have the slightly closed in high frequency extension like the 80’s tubes.  
lowrider57's avatar
lowrider57
5,417 posts
 
@testpilot 
Thanks for that info. I was wondering if there was a QC issue; first big Greg, then I lost a tube from the same batch (I think).

When you refer to "closed in highs" do you mean less extension or less high-end energy than 1970s?
The Melz followed by a Sylvania GTA in my amp have terrific highs. 

big_greg
6,646 posts
 
If you have issues with the 1578's, your first course of action should be to contact the seller.  I'd avoid trying things like re-soldering unless you can't get satisfaction from the seller, or you don't care about taking a loss if you're unable to return them due to modifying them.
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