I found a TV/Stereo repair place here in ABQ that has a Lorenz TV7 A/U tube tester, they checked 8 tubes for me for $40. (I don't know if that is cheap or expensive, probably just paying them for their time). They repair all kinds of vintage equipment -they were working on a couple Magnavox consoles from the 60's and a Beogram turntable with bad capacitors--they don't work cheap but cheap work doesn't last.
My set of Psvane Horizon CV181 AT tubes that I bought as two separate pairs had tags on top that said 9.0 / 9.0 (tubes 1 & 2), and 8.5 /8.5 (tubes 3 & 4):
Tube 1: 88/89 8.6/8.6 mA and 2200 gm (whatever that measures? The tech said above 1250 gm on the TV7 tester is good, as is 50/50 and 6.5 mA)
Tube 2: 89/90 8.6/8.7 mA and 2250 gm
Tube 3: 84/86 8.0/8.1 mA and 2100 gm
Tube 4: 83/86 8.0/8.1 mA and 2050 gm
The tech said these were pretty well matched for a Freya+ as long as I keep the pairs together and not mix them up, plus I should put the stronger pair in the gain side. These tubes sound really really good, though some folks on this site say they must suck because they're Psvane and, Heaven forbid, bought from Amazon. So much for them being junk, I just hope they last for a while, guess I'll find out over time.
The APOS Ray Select 6SN7 were bought as a matching quad directly from APOS, but had no stickers on top, hence the reason for having them tested:
Tube 1: 97/98 9.5/9.5 mA and 2650 gm
Tube 2: 98/98 9.5/9.6 mA and 2700 gm
Tube 3: 98/99 9.5/9.6 mA and 2700 gm
Tube 4: 98/99 9.6/ 9.6 mA and 2700 gm
The tech said these were about as perfect a match as is possible, and they are very strong. They are currently in the Freya+ in the office "breaking in", I'll play them tomorrow after they idle all night. In the mean time, I must search my CD collection to ensure there aren't any Nickelback CDs in there...


