Benson Monarch

[Aaron]

Aaron:
did you get chance to post those voltages yet.

Dorrisant:
Have you had a go at one yet

Hi Shane,

Revised schematic with voltages are on page 2.

Thanks,
Aaron

[brewdude]

Thanks for updating the schematic.
Did you happen to take the B+ voltage readings?
Also, what rectifier tube is it using? 5Y3GT?

[shane]

Thank you Aaron very cool mate

[turbofeedus]

Thanks for updating the schematic.
Did you happen to take the B+ voltage readings?
Also, what rectifier tube is it using? 5Y3GT?

Benson site says 5AR4. Makes sense for the schematic at ~50V drop.

[Aaron]

Yes, 5AR4 rectifier

[brewdude]

Thanks

[chasbenson]

I'm bored on a plane and came across this. I must say I'm flattered to join the ranks of traced stuff on here...I've used this forum as a resource many times over the years, especially when I was doing repair work. Hopefully it is helpful of me to point out at first glance of the shared schematics that the power supply for the Monarch is not correct and will probably hum as drawn, the Tall Bird output buffer will not work as drawn, and the Vinny power tube grid stopper should be 27k, not 2.7k. bonus note: we use all .02 for the PI caps in the Monarch these days since gets rid of a bit of tubbiness but I haven't switched my personal amps over because it really doesn't change much.
Regards,
Chris

[pompeiisneaks]

Yeah, that's what I'm talking about! Someone that knows their amps are worth the purchase as is, and also is happy sharing with us!

Man when covid's over I'd love to stop by, see your shop etc, since I'm here in the Seattle area.

~Phil

[shane]

Man that's great to hear from the maker, thanks Chris it's very generous of you to help out. You make lovely anps by the way!

[chasbenson]

Post covid sounds great!

[pullshocks]

I'm in Seattle too, would love to join, whenever this becomes possible.

[dorrisant]

I'm bored on a plane and came across this. I must say I'm flattered to join the ranks of traced stuff on here...I've used this forum as a resource many times over the years, especially when I was doing repair work. Hopefully it is helpful of me to point out at first glance of the shared schematics that the power supply for the Monarch is not correct and will probably hum as drawn, the Tall Bird output buffer will not work as drawn, and the Vinny power tube grid stopper should be 27k, not 2.7k. bonus note: we use all .02 for the PI caps in the Monarch these days since gets rid of a bit of tubbiness but I haven't switched my personal amps over because it really doesn't change much.
Regards,
Chris

Wow, so nice to see you here!! Obviously, your circuits are top notch, but even cooler that you help with some constructive criticism. Very refreshing!

Out of curiosity, how close is the layout I posted? I had no pics of the reverb circuit to go by and I know that the filaments are not DC, like what is found in your amps.

[dorrisant]

Dorrisant:
Have you had a go at one yet

Not yet... I'm trying to get some plates cut and engraved first (top, face and back). As soon as I get them done, I'll build it and post.

[chasbenson]

@dorrisant
I don't put reverb in heads because of noise, and reverb grounds can be very fussy, so I can't speak to that portion of the layout. I glanced over the rest of your layout for a few seconds a few days ago and didn't see any obvious errors, but I'm not going to take all the fun out of this for y'all

[dorrisant]

Thanks man! You are top notch in my book. I love the challenge left. I promise to only build one... and I won't sell it.

Three cheers for this guy!!