Hi,
Dynamic Turtle said:
Do you mean the Ladyday+ 300B monoblocks?
Ahhm, yes. I coined the name that stuck, but never got really used to it...
Dynamic Turtle said:
Given the price, and the fact that they have been designed with DIYers in mind, have any "luxuries" that one would normally find in 300B SET's been discarded along the way?
No, on the contrary. They include circuit design details and technologies (either optional and/or as standard) which are not found in most "cost no object" commercial designs.
I would cite as examples the WE connection of the output stage, the options to use extensively film capacitors in the signal circuit and power supply, the option to use tent lab heater supplies and the optional use of gridchokes in the standard LD+ (LD+91 cannot use Gridchoke), amorphous output transformer option and so on.
If you load up the LD+ or LD+91 (I'd suggest the 91) with the full options you still have an affordable amplifier but one which offers technology and performance not really found in ANY commercial Amplifier all together, no matter what prices we are talking.
How this translates into sound is another issue. Ask others, I may be too prejudiced as quite a few or the tricks originate with me....
Finally, Brian is working on an Amplifier (kit) using the 300B+ Valve from TJ, which will produce around/over 20W per channel.
BTW if you accept a little less output power for the Amplifier at low frequencies could also be build up an Amplifier for the 300B+ using the LD+ Kit (it was origionally designed with that option in mind). Use the original 6SL7 Mu-Follower driver with Gridchokes and the highest voltage available from the universal PSU Transformer (around 450V +B @ 110mA).
You need to add fixed negative grid bias (easily done, Rupert Rupertson shows it for a Kit1 here:
http://www.users.globalnet.co.uk/~valveamp/RupertRobertson.htm ) but otherwise you will be fine. The output transformer limits you to around 15W RMS @ 30Hz, which usually is fine....
Ciao T