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For what it's worth, I've seen this on NOS tubes here and there over the years...nothing that prevented use of the tube(s), just tight.

Absolutely correct about the glass thickness. To further enlighten everyone, the earlier batches were smaller. New Sensor made the change to a thicker glass "envelope" to reduce microphonics and other residual noises...per Mike Mathews at New Sensor. The current runs are thicker, but the actual...

mxr phase 90

The tubing was originally used to reduce "glass ring"/microphonics. I know that some current production 12ax7's are being made with a thicker envelope (glass) to reduce noise problems that included the microphonic glass (think Tung Sol). I haven't ordered a spax7 in years now so I can't really...

You know, if it ain't broke.... Honestly, what works for is is perfect for you. The Rocktek stuff is pretty generic in terms of design...and their plastic enclosures can't withstand heavy duty stomping for years on end. However, if the 6 bands work with minimal noise and the enclosure hasn't...

We tried them out when testing current production EL34's for our amp. The came in a close second followed by the SED's which up to that point were our favorite (current production). We ended up going with the TAD EL34's as they seemed to exhibit a fuller tone....and came in matched at no greater...

For those who aren't aware, the MXR Smart Gate is Tom Scholtz's (Rockman) design and used to come in a half rack enclosure. This might be of educational worth.... http://www.wolfgangregistry.com/guitar-reviews/smartgate.html

This is why I recommend that my clients never do this. I'd suggest on looking at spending the money saved on amp repair to go to buying an attenuator like the THD Hotplate or the Allesandro Muzzle.

This might help those new to the bias game... http://www.eurotubes.com/euro-video.htm

Word to that brother!

I encountered the larger bottle Tung Sols about a month ago. To make a long story short, per Mike Matthews, they had to increase the bottle size in order to problem solve noise issues that they have been having with the later production (small bottle) 12ax7's. For what it's worth, the larger...

Absolutely Yes!

Yes, you can damage circuitry by over-volting. Some products have designed protection circuits into them. The problem here is whether or not the Tonebone has that protection or not. I'd suggest that you follow what the manufacturer says in it's user manual/spec sheet. Or, contact Peter at...

Tyrant, yes, this is a "blanket statement" as all tube amps should be biased to their tubes...even cathode biased amps can stand to have the biasing/voltages checked and tightened up to the new tubes. Saying this does not say that dropping in new tubes will sounds bad...to clarify, biasing gets...

OK, you've got MY attention :D

Here's some info that contradicts the Mesa claim. This comes from Myles Rose..considered to be an expert in the tube field (think Groove Tubes and Guitar Amplifier Blueprinting). In the case of Groove Tubes, they use a rating scale of 1-10. Mesa Boogie uses a color code system. Here is the...

From my point of view, it's not that they're not as dependable, it's the construction design is a PITA to do the work...though I've seen cracked boards/trace work in more than a few newer ones :?

Those Coke Bottle 6L6's have a real nice compression and tone to them...for a while there they were all over the place..in regards to the Chinese 6L6's.

Murphy Slaw, all is good! The Prosonic is definitely a keeper if you can afford to do so. Score the Nomad, let it's warranty run it's course and I'll detail out you can do the biasing yourself with watever matched tubes you choose..and if you're real handy with a 40 watt soldering iron, I...

One thing that I know for sure.....they come with matched EL84's :D Groove Tubes nonetheless. I couldn't resist....but really, I have a client that has one of the early production units that is his "go to" amp. To my ears, it's a very smooth sounding amp...not a whole lot of high gain...