Hey-Hey!!!,
I am building a pair of monoblocks with 4E27 finals. It is a valve somewhere between a HY69 and an 813 in ratings and dissipation limits. L-C power supply of between 600 and 700 volts. Current delivery of ~300 mA. Ultra-Linear rigging of the finals and E-Linear front end. Cascode differential amp like Merlin. I am not exactly sure how the finals like their U-L connection, so I will be fairly sure of getting where I want to be with those options.I need to get paid a few times before I order the Iron, but I don't think anything will change very much. I have been fairly sure of this design for a bit now. It's just a matter of scale, those OPTx's would be just as happy with a pair of EL84's as 845's.
Still need to decide upon the specifics of the cascode front end, there are quite a few options. I will be posting notice before ordering the OPTx's so as many folks as possible can throw in their money and net us a good price on a bigger run of them.
regards,
Douglas
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