Amperex PQ 6922 vs Amperex PQ 7308

The Amperex 7308 was an attempt by manufacturers to make a tougher and longer lasting tube. This tube was made starting in 1959. The older the tube, the better the sound quality--or so they say. The white letter PQ with shield is the best sounding. They made a USA and a Holland version. The Holland is sapposed to be sweeter, but not quite as dynamic as the USA. Also, in 7308, they made an orange lettering/orange world globe logoed tube. I've tried this tube. It's better than the JAN green letter tube by quite a bit, but not as good as the PQ with shield. The JAN green letter is not as open as the two tubes above. Currently, I'm running four Amperex 7308 white letter PQ with shield in my Bat preamp. Good tubes make a huge difference.

I ran out of space on my last post-- As dogpile said JAN is military use. I've also seen JAN orange world globe logo tubes . I've heard that on earlier 7308 tubes, they may be white lettered only (and still be PQ) or they may be white lettered and say PQ but not have a shield. It's kind of a mess. Other manufacturers also put their label on these tubes as well. Sorry if I repeated some of the info repeated by others. Where's Joe when you need him? Dekay, have you tried any of the earlier 7308 Holland PQ tubes? How do they sound? Ive never had the chance to try any Holland version PQ's.

I hope that I didn't step on any toes by diving into this thread. I was just relaying what I've learned from Andy @ Vintage Tube Services and what I've learned in 6yrs of trial and error with small signal tubes. Ed- I read your review of the Shuguang/Super TNT 845B tube. It looks like you've been around tubes for a long time... as I said, I hope that I didn't step on any toes. Best! Stan

I think that either the 7308 or the 6922 PQ would smoke the Ediswan tube. The 7308 would probably have more longevity and be a quieter tube than the 6922. I tried to Email this to you but I got server error messages. If you want a reccomendation of a good place to buy tubes, click on my system for my Email.
Best! Stan

The JAN- (Joint Army Navy) tubes that I've used were the 7308 Green Letter-1976 and the 7308 Orange Globe Logo-1967. The older the tube the better. I've never tried an older JAN tube like a 7308 white letter JAN-USN. I've heard that they are very good. So the difference between a JAN tube and a PQ depends on what year/type of JAN you have. I'd still rather have a PQ over a JAN-USN, but who knows, some JAN-USN could be PQ-Premium Quality, before lettering.(ie. the same tube) If I ever have a tube question that I can't find information about, I call Andy @ Vintage Tube Services. He's very knowledgeable. Dekay-- Thanks for relaying your experience with the Holland PQ tubes.It's a big help.

Sir speedy, The premise that I use for the PQ being better than the Ediswan is both the placement of that tube in "Joe's Tube Lure"- (the order looks like average to best) and what Andy of Vintage Tube Services indicated on his website-(go to Inventory List, than "6DJ8-6922-7308"- read what he said in that descriptive boxed area heading.) I've never actually heard an Ediswan tube, so I'm going by my interpretation of what the experts have said. Also, in your 3/1 post, you did ask if you were wasting your time persuing a good set of PQ's. I'm sure that your Ediswan tubes sound good. But... I feel that a GOOD set of PQ's will sound better. Best! Stan

Sirspeedy, You didn't mention that your Ediswan tubes were actually low noise Mullards until your 03/05/05 post. An "Ediswan tube" could have been any of several brands. Low noise Mullards are fine tubes indeed. That being said, I'm still curious, How did the "Great Amperex vs. Mullard/Ediswan shootout" turn out? Did the Amperex PQ's hold thier own against the low noise Mullards?

Sirspeedy, I'm currently running 4 sets of matched low noise 7308 Amperex PQ with shield--circa 1963 and 1964-- in my Bat vk5i preamp. These tubes were bought from "Sam"-here @ audiogon and from Brenden @ Tube World. They both also carry 6922 PQ's. My tubes are still going strong after 1 years use. I would buy tubes again from either of these people. Also, I had two sets of these tubes checked out by Andy @ vintage Tube Services, a year ago, when I first bought them. He rated them as excellent with no microphonics. He said that they're the real thing. Just a recommendation of tube sellers, in case you may want to buy some PQ's. Best, Stan