Elrog 300B vs Takatsuki 300B tubes
Excellent info, Joe (& George). That all seems very comfortable relative to the specified "limiting operating conditions for safe operation" of the Elrog tube. (79V/1.025K = 77 ma). And the plate dissipation which can be calculated from those numbers is actually closer to 31 watts rather than 32. Enjoy! Best regards, -- Al |
Hi Al, In your opinion given the values that George measured, do you feel these represent a high stress level on the 300b tube or more of a moderate level? The heat dissipation levels measured by George are higher than the 26 watts that Israel cited for the amplifier. Although 31 W seems well off the maximum of 39 or 40 W dissipation for the 300b. Is the plate voltage similar to your VAC Renaisance? Thanks, Charles, |
Hi Charles, My only knowledge of the 300B operating parameters in my VAC Renaissance 70/70MkIII consists of the values Raquel provided in the thread I quoted from earlier. In which he said that the plate-to-cathode voltage is approximately 430 volts (compared with 484-79 = 405 for the Elrog in this case), with an idle current of approximately 85 to 90 ma (compared with 77 ma for the Elrog in this case). Also, based on those numbers for my amp, 90 ma x 430 volts = 38.7 watts plate dissipation. The numbers George measured for the Elrog seem to me to be moderate. Best regards, -- Al |
Al and Joe, Thanks much! These measurement findings do suggest that the Elrog tube should be fine in the Frankenstein amplifier. Al your selected 300b tubes must be vefy rugged to tolerate the parameters in your amplifier and provide the durability and longevity they do I need to measure my wall outlet AC voltage to be sure that it is not excessive. Charles, |
