Jet City - JCA22H Tube Question

[auburn-grad]

Does anyone have a link to a schematic or a tube chart for the Jet City 22H ?

Or...does anyone know which tubes are which (V1, V2, etc) and which channel each one is responsible for ?

..thanks.

[auburn-grad]

..anyone ?

[briango2000]

V1a Shared Crunch/OD
V1b Crunch
V2 OD
V3a Shared Crunch/OD
V3b Cathode Follower
V4 Loop
V5 Phase Inverter

[t-rey]

Sorry to bump an old thread, but I am curious about the 22h as well.

So if I were to put a lower gain tube (5751, 12at7, etc) in V1b would it clean up the crunch channel without lowering the gain of the OD channel?

[partsocaster]

How is this amp? Does it take pedals well? How is the loop?

[mjtripper]

Originally Posted by t-rey

Sorry to bump an old thread, but I am curious about the 22h as well.

So if I were to put a lower gain tube (5751, 12at7, etc) in V1b would it clean up the crunch channel without lowering the gain of the OD channel?

v1a and v1b are the same tube. Since it's a shared tube it would lower the gain for both.

[t-rey]

Yeah - looking at it now, my question made very little sense

A couple months ago I actually pulled the trigger on a 22h. It's a great amp, but the stock preamp tubes NEED to be replaced. I was really surprised at how much of a difference putting JJs in v1, v2, and v5 made (only had 3) and a 5751 in v3 tamed it all a bit.

At low volumes I actually quite like the semi-cleans, but there are no cleans with humbuckers at high volumes. There is apparently several mods to make it more SLO like and have a clean/crunch switch, which I may have done in the future.

It takes pedals pretty well - the SLO channel doesn't seem to like being boosted all that much, but sometimes I still use my LTD to tighten the low end and make it a bit more aggressive.

Overall I am seriously happy with it. Even more so now that I have an attenuator to go with it. It sounds good with the volume way down low, but it's a pretty loud amp, and the attenuator really helps get it in the sweet spot at a reasonable volume.

[partsocaster]

Originally Posted by t-rey

Yeah - looking at it now, my question made very little sense

A couple months ago I actually pulled the trigger on a 22h. It's a great amp, but the stock preamp tubes NEED to be replaced. I was really surprised at how much of a difference putting JJs in v1, v2, and v5 made (only had 3) and a 5751 in v3 tamed it all a bit.

At low volumes I actually quite like the semi-cleans, but there are no cleans with humbuckers at high volumes. There is apparently several mods to make it more SLO like and have a clean/crunch switch, which I may have done in the future.

It takes pedals pretty well - the SLO channel doesn't seem to like being boosted all that much, but sometimes I still use my LTD to tighten the low end and make it a bit more aggressive.

Overall I am seriously happy with it. Even more so now that I have an attenuator to go with it. It sounds good with the volume way down low, but it's a pretty loud amp, and the attenuator really helps get it in the sweet spot at a reasonable volume.

Thanks for the info, my buddy wants me to buy a Soldano Lucky 13 but that kind of cake doesn't come easily. Of course he has a friggin' SLO-100 so it's not really fair to discuss this sort of thing with him at all, he's so biased!

[mjtripper]

I've wanted one of these for a while now and finally had a chance to pick one up. I've spent a little time playing with tubes and as already stated just replacing the stock tubes makes a huge difference. There appears to be some crosstalk if you have the od channel set to really high gain and the crunch set to low. A little bit of the od bleeds through which I believe isn't all that un-common for soldano type amps. I called jet city and they also confirmed that is normal. The crunch channel really doesn't have much clean signal at all, with the od turned all the way down for no bleed and the crunch master up with the gain as low as it will go and still make a noise there is still a little breakup when you hit the strings hard.

What I did was replace v1 (closest to the input jack) with a groove tube 12at7 to lower the overall gain and then replaced v2, v3, and v4 with average sovtek 12ax7 and v5 with a sovtek 12ax7lp for the pi. The crunch channel now sounds clean up to gain of around 2-3, the bleed is significantly reduced, and the overall gain on the od is also reduced. What used to be 7 or 8 on the od gain is now 10. Plus the overall tone and sound of the amp is much much better. None of these tubes are nos or anything special, just some I had sitting in the parts box.

[rumsfield]

So you would all recommend retubing for sure? I have one coming in the mail...