[takezo]

here's a start off point for the wa6 and the upgraded ones too:

input tubes:

5ar4 = gz34 =cv1377
5u4g = u52 = 53ku = cv1575
5u4ga/5u4gb/5u4wg
5as4
5v4g =gz32
5r4gy = cv717
5r4ga/gb/gya/gyb/gys/wga/wgb
gz30 = 52ku = 5z4g
gz32 = 5v4g
gz33 = u54
gz34 = CV1377
gz37 = CV378
274b rigid plate only/need to change 1st cap for the mesh type
422a

output tubes:

6de7
6ew7

 

[Kahuna]

I've used 4 different valves off takezo's list, and one of my favorites is a JAN 5R4GA. Solid, defined bass, transparent mids, fluid highs. (Fantastic bang-for-the-buck in my view).

 

[HeadphoneAddict]

I thought the 6EW7 wont fit unless Jack makes the two front holes bigger?

 

[musicmind]

Larry, I believe the 6ew7 can be used with the aid of an "adaptor" which is seated into the current tube sockets. These can be ordered from Jack Wu.

 

[jamato8]

Quote:

Originally Posted by HeadphoneAddict /img/forum/go_quote.gif I thought the 6EW7 wont fit unless Jack makes the two front holes bigger?

They also made the skinny 6EW7 but they are hard to find.

 

[HeadphoneAddict]

Is this a fair deal? Amperex Metal Base GZ34 Vacuum Tube - Rare - eBay (item 300213308754 end time Apr-10-08 19:27:00 PDT)

 

[jamato8]

If the TV7 is calibrated then no, the tube is about shot. A good tube or new one will measure 58 to 60. I have measured many of these and that is the new to good used point on a TV7. A 48 is a poor rating.

 

[HeadphoneAddict]

Quote:

Originally Posted by jamato8 /img/forum/go_quote.gif If the TV7 is calibrated then no, the tube is about shot. A good tube or new one will measure 58 to 60. I have measured many of these and that is the new to good used point on a TV7. A 48 is a poor rating.

oh crap.

 

[jamato8]

Quote:

Originally Posted by HeadphoneAddict /img/forum/go_quote.gif oh crap.

I would ask the seller if they have any new 5AR4/GZ34's and what do they measure at. This would tell you where this tube is in relation to a new tube on their TV7 but 48 would be off quite a bit in calibration but that is the only way to know or ask if the TV7 has been calibrated recently.

 

[jamato8]

Quote:

Originally Posted by HeadphoneAddict /img/forum/go_quote.gif oh crap.

Well it is a 1955 solid plate, which aren't too common. Hope it sounds great.

 

[Huck]

Quote:

Originally Posted by jamato8 /img/forum/go_quote.gif If the TV7 is calibrated then no, the tube is about shot. A good tube or new one will measure 58 to 60. I have measured many of these and that is the new to good used point on a TV7. A 48 is a poor rating.

Hi: If a tube measures low or border-line,how long will it last and will a tube that's almost done exhibit certain qualities, such as making noise or a low gain and can other parts be ruined by installing a "not so good" tube into a new piece of gear?! Thanks, Huck

 

[takezo]

this is one of the earlier version of the metal base, the ones without
any holes in the plates...these earlier ones do generally measure
lower than the 57 version, the ones with holes in the plates...

a life test should tell you if the tube has some longevity left in it
or not...do the same test rated at 4.3volts instead of 5.0volts...
if the test figure changes by more than 20% then it's on its last
legs...

 

[HeadphoneAddict]

A new Sylvania GZ34 measures 51/51 on his tester.

Quote:

Originally Posted by email from seller Larry, I understand your concern..The TV 7 tester was purchased from Dan Nelson in AZ..I also have a B&K 747 tester, I tested the tube on both and got good readings...I also have a NEW in box Sylvania GZ34 up for sale and it read 51/51...???So 48 is not that off...Maybe my tester is not 100%, I don't know...I am not saying that the tube is new, but it is good ! I do not sell anything that is not up to snuff...Sorry that you feel you paid too much, but they are very rare...I will await to hear from you before I ship tube..

 

[HeadphoneAddict]

I emailed him more questions about the results from the other tester. I am inclined to take it, as that's what eBayer's with 100% feedback do, especially since a new GZ34 tests at 51.

 

[HeadphoneAddict]

Quote:

Originally Posted by ebay seller Larry, Tested the tube on the 747 tester...It read 76/74 and on the life test it dropped to a solid 68/66...On the meter 0-55 is NG and 60 has a ? in it...I also tested a NOS Mullard GZ34 and it read 87/86 and on the life test : 79/78...Yes the tube has some "wear" on it, but it works..I can't say how long it will last and don't know what to tell you..I am being honest and want you to be happy..You let me know...I can ship tube out tomorrow along with others I have going.. Thanks, Joe

How does that sound?