F5 power amplifier

[tinitus]

Originally posted by sangram


If it's not too much trouble, could you share that separately?

Im no tube expert
On that grounds I would build either Aikido or maybe look at Diy Hifi Supply

But you better ask at Tube forum about this

[Renron]

Aikido +1

Ron

[dcbingaman]

Aikiko +2 John Broskie's circuit is a perfect match for an F5 power amp from both a "temperment" and gain standpoint. (BTW, the gain can be tailored from unity to 50 via selection of the input and cathode-follower tubes.) Check out John Broskie's new "All-In-One" board with integrated B+ and heater regulated power supplies which he recently began shipping.

[tinitus]

Originally posted by dcbingaman

Aikiko

the gain can be tailored from unity to 50 via selection of the input and cathode-follower tubes.

Are you sure about unity gain

[sangram]

Thanks, that's enough to get me started

[Zen Mod]

12B4

[Renron]

Originally posted by tinitus


Are you sure about unity gain

When using a 6as7 triode the MU is around ~2. That's pretty darn close to unity gain.

Broskie's tube chart

Ron

[npapp]

Hello, I made some adjustments based on earlier comments to my layout for a F5 with parallel output mosfets. Can anyone take another look through for potential issues?

Also 2 questions,
1. Is it better to route the signal traces around the perimeter of the board v. crossing under the power and output trace?
2. Will the thermal compensation circuit still work with parallel devices, and if yes do I need a thermistor at each mosfet or just one per p/n channel?

Thanks everyone for entertaining a noobies questions and of course NP for everything you share.

[nigelwright7557]

Originally posted by npapp
Hello, I made some adjustments based on earlier comments to my layout for a F5 with parallel output mosfets. Can anyone take another look through for potential issues?

Also 2 questions,
1. Is it better to route the signal traces around the perimeter of the board v. crossing under the power and output trace?
2. Will the thermal compensation circuit still work with parallel devices, and if yes do I need a thermistor at each mosfet or just one per p/n channel?

Thanks everyone for entertaining a noobies questions and of course NP for everything you share.

I usually put all my power and output tracks at one end of the PCB away from small signal tracks.

[Nelson Pass]

Originally posted by npapp
1. Is it better to route the signal traces around the perimeter of the board v. crossing under the power and output trace?

2. Will the thermal compensation circuit still work with parallel devices, and if yes do I need a thermistor at each mosfet?

The Oracle sees all, tells all.

1 It doesn't matter as much as you think it does.

2 Yes, and No.