- Posted by dth31 on December 15, 2004 at 14:58:22
Hi Brian. Exciting to see the new "91 parts pak" for the LD+.Will this pak work with the old version of the LD+? Do you need to use the new transformer with the new rectifier/driver tubes?
I don't see the S&B grid choke mod in the internal view of the 91 pak-modded LD+--if the S&B grid choke is currently installed, does it have to be removed? Modded?
Thanks for the assistance!
Dave
Follow Ups:
- Re: Ping Brian Cherry: LD+ and 91 parts pak - bcherry 20:21:51 12/15/04
(0)
- In Reply to: Ping Brian Cherry: LD+ and 91 parts pak posted by dth31 on December 15, 2004 at 14:58:22:
The OPT is OK. But to do the 91 circuit, you would need to wrap some extra turns on the 6.3v power tx winding to get 9-10v for the 310A filament. Same to use the tentlabs filament supply, would need to add some turns to get +2vac to add to the filament secondary if you wanted that option. It is do-able, we did it for the prototype.
Brian
Take control! DIY.
- Re: Ping Brian Cherry: LD+ and 91 parts pak - Thorsten 16:57:23 12/15/04
(0)
- In Reply to: Ping Brian Cherry: LD+ and 91 parts pak posted by dth31 on December 15, 2004 at 14:58:22:
Hi,
The source impedancefrom the WE 310A Pentode used in the 91 Schematic is very high and current used is fairly low. That means that the result may be that with the gridchoke the bandwidth is constrained (bass and treble rolled off). If it's there already trying it out will cost nothing, I do intend to have a bash myself later....
Ciao T
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