JCA22H bias problem

[LP Freak]

I've never redplated a power tube. Does it literally turn red?

But also, if the bias is too hot, besides instantly redplating, doesn't it shorten the tube life significantly?

A lot of times the amp will hum as it’s heading toward redplating

 

[scottosan]

I bought a pair of Russian 6p14p's, based on another JCA22H owner's suggestion. Every other amp I've ever owned had bias test points. But, of course, this amp doesn't, and I want to get it set correctly. I bought the SRS bias probe. Thanks for everyone's help!

My money is on robs method being correct and that those tube are drawing a lot of current.

 

[ledvedder]

Is this the only amp you’re ever going to bias?

My other amps have bias test points.

 

[LP Freak]

My other amps have bias test points.

So I guess you’re counting on every amp from here on out will have them too. What I’m saying is it’s a good investment

 

[ledvedder]

So I guess you’re counting on every amp from here on out will have them too. What I’m saying is it’s a good investment

I bought a 9 pin bias tester.

 

[155]

I bought a 9 pin bias tester.

there ya go

 

[jchrisf]

I bought a 9 pin bias tester.

I was just looking on Epic's site and they have a mod for external bias points.. but getting that tester was probably more economical.

 

[napalmdeath]

Is this the only amp you’re ever going to bias?

I bought mine 4 years, and 30-40 amps ago. Paid for itself almost immediately.

 

[ledvedder]

Just an update. I got a new multimeter and the tubes are testing correctly now. Each are at 23.6 and 21.4 mA.

 

[napalmdeath]

Just an update. I got a new multimeter and the tubes are testing correctly now. Each are at 23.6 and 21.4 mA.

How's it sound?

 

[ledvedder]

How's it sound?

Sounds great! Crazy that for around $300 I'm enjoying this amp so much. After the holidays, I think I'll be on the lookout for a 50 watter.

 

[jchrisf]

Sounds great! Crazy that for around $300 I'm enjoying this amp so much. After the holidays, I think I'll be on the lookout for a 50 watter.

I thought the JC sounded better than the Soldano in this video

 

[311splawndude]

YAY
Good feeling