The Amp Garage

What amp? Like I said, you usually use a cathode follower to drive a high impedance, lossy load like a tone stack that doesn't have a gain makeup stage following it. I don't think that would be a problem with a PI.

Cathode followers are used to drive high impedance loads, like a tone stack. Why do you want to use one to drive the PI? I really don't think it is necessary.

Bluesky, I ordered the last G12H UK-manufactured Anniversarys that New Sensor had in stock several years ago. When I A/B'd them with the Sino models, I could not hear any difference. There is a huge difference between these drivers and the Heritage however. For the money, they're great, for the ton...

Just finished installing and trying out my cab loaded with the Celestion G12M Greenback Reissues (16 ohm, 25 watts), I decided to go with the 16 ohm versions just for that old time Marshall grind. Holy shit Batman! These things have completely changed the sound of this amp. Yea. It is amazing what ...

Instead of grid stoppers, which actually can add to white noise (speaking of experience). I prefer shielded cable for v1 grids. Also to stabelise an amp.. you can create negative feedback. Running anodes/kathodes parallel. And the PI wires twisted. Still experience too much hiss? Then I prefer to p...

Just finished installing and trying out my cab loaded with the Celestion G12M Greenback Reissues (16 ohm, 25 watts), I decided to go with the 16 ohm versions just for that old time Marshall grind. Holy shit Batman! These things have completely changed the sound of this amp. If they sound this good j...

This thread has inspired me to crack open the java kit I built many years ago. It was the very first "big" amp I ever built and was mostly stock. I discovered something. The more I changed it to be like an express the better it got (big surprise I know :). Eliminating the cathode follower made the ...

Just placed an order with Sweetwater for a full compliment of Celestion G12M Greenback reissues to go in my Crate 4x12 cab. Yeah, they are the made in China ones, but I can't afford the British made Heritage series. The only thing that made them affordable is that Sweetwater has a 2 year, no interes...

leadfootdriver wrote:JJ 6CA7's are the answer to all your prayers.

I'm running JJ E34Ls which I like very much.

I tried this out the other day. It did make an audible difference (for the better). In my case, 100 ohms did not cut it. The lowest I could go was 10k. And at 10k it made something go away. There was a bit of a harsh crackle thing going on that is now gone with the grid stopper. I'm starting to see...

Well, I'll definitely be leaving the shields on the preamp tubes of my amps, particularly the Wrecking Ball. I left the shields on, fired up the amp and turned it up all the way. Hiss but no interference from the high power wireless router. Then I shut the amp down, removed the shields and fired her...

Nobody is shooting anybody down here.

Probably wouldn't be a good idea to combine a cap bypassed plate circuit with a large grid stopper in the same gain stage.

Richie wrote:You can also look up most any of the tube data sheets that show the differences with or without shields used.

Link to many different tube brand data.

http://tubedata.milbert.com/sheets11.html

Seems like a trivial difference to me:

http://tubedata.milbert.com/sheets/093/1/12AX7A.pdf

I'll give it a try without the shields.

I use the Eurotubes dampers on my combos, and my amp head sits on Aurelex foam on top of the speaker cab.

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