Thanks for this “current 40” matched 6V6 set. So much better sounding and more lively in my ‘65 Princeton, than the “current 29” set you sent last summer. These (in the 43 to 40 range) are the game changer for this already smoking amp! Thanks so much.

I've built and sold several 5F1 amp heads recently. I like using a JJ 6V6S power tube in them for their consistently excellent sound and reliability. JJs have never let me down in this regard.

Great

JJ's seem to be the best bang for the buck and handle high voltage well.

I am seeing issues with the glass in JJ power tubes, more and more. As a vacuum tube is being evacuated (having the air pumped out) traditionally the tubes had a gas flame applied to the glass to help all the air get evacuated. This is a dual process where the extreme heat cooks off moisture and drives out all of the air and other impurities, and then the pinch is closed off and the glass needs to cool at a controlled rate to properly anneal the glass. Traditionally glass items are annealed in a lehr, but with vacuum tubes the annealing happens while the tube is having the air sucked out. JJ has been cooling their tubes MUCH TOO FAST, creating stresses within the glass that will break the glass when the tube is heated from being in 100% normal use within design parameters. So JJ is definitely NOT burning any of their tubes in at all on a test jig, or the simply do not care if a sample batch shows a whole batch is faulty.

I have nothing to compare them to at the moment but I can tell you the amp came with Grove tubes and it never turned it on until I replaced those with the Apex matching burned in JJ 6V6S valves . I love the way the amp sounds even though I need to Bias it soon to help the new valves really do what they are meant to. Thank all at Antique electronic supplies for all your help! If you need anything this company is the place for it. Fast, quality, & accurate service every time!?

Thank you for prompt shipment last week. I put these nice looking tubes in my restored Philco 46-1209 AM/SW/Phono console radio (1946 vintage). It is now performing great with this pair of JJ 6V6S. One of the 6V6S has a slight blue glow, but I am reading on internet that this is considered normal for these tubes. This is my first time to try JJ brand. I hope they will last many years.

5/5 The JJ 6V6 power tubes are stout and sound great in my Fender '57 Deluxe Reissue. I've used JJ tubes for many years in other amps and they always work good and last long.

Replaced old RCA tubes in a Fender Princeton reverb with a matched set of these. Replaced the screen grid resistors with new ones that were also matched in resistance (measured and hand selected). Fixed bias is now perfect and amp sounds wonderful.

AES always provides good JJ tubes for the right price. I have bought many of them over the years. These went into a 1963 Princeton (non reverb) tuxedo cosmetics that my customer found in a barn. The amp sounded wonderful whenI finished cleaning and doing a few minor repairs. Just what this amp needed.