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Title: KT-77 with HRM Bluesmaster Post by: mwdavis14 on November 12, 2013, 07:33:14 PM has anyone tried these tubes? Highly recommended to me for the dumble Bluesmaster circuit by Brandon of Bludotone. I have MM transformers, and have verified w/MM that the PT and OT will "easily" run them w/no issues. In most locations, PT OT ability to handle the higher heater current is only issue flagged as concern. I'm not a circuit designer, so hoping someone can say whether or not this tube would present any issues in the Ceriatone HRM Bluesmaster cirucuit? I've searched through the forum and have seen no answer already noted, although a few folks seem to have tried the tubes. Many Thanks!
Title: Re: KT-77 with HRM Bluesmaster Post by: plasticvonaband on November 30, 2013, 10:06:23 PM The KT-77 is a higher wattage version of the EL-34. In theory, using them would result in an EL-34 type sound, but with more headroom. I say in theory, because most of the OTS circuits get the majority of the tone from the pre amp section, and the power amp section is biased relatively cool and doesn't generally color the sound too much. There are exceptions, of course. For example, the Bluesmaster tends to get a lil more dirty/overdriven on the clean side when pushed hard due to the design of the PI allowing it to break down more, and the clean preamp has more overall signal output, particularly in the lows and low mids, and can push the output tubes a lil more.
If you don't want the typical EL-34 sound, and want to experiment with higher wattage/more headroom output tubes, I recommend the KT-88. They will sound more like a 6L6. A couple of folks here in the forum have used em with no probs, even on stock iron. Either way you go, be sure to use a bias calculator program, as both will require much higher bias current than a 6L6, EL-34, or a KT-66. Hope this helps! Gregg |