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In Reply to: RE: Are my ITs ok for this schematic? posted by Triode_Kingdom on August 21, 2014 at 11:06:39
TK, that is the DCR measurement. I checked the Lundahl 1660 specs and I believe they are saying that the dcr is about 700 ohms on the primary and slightly less on the secondary. I am not familiar with ITs and wanted to hear what an amp with an IT sounds like. So, I guess that if I want to use this circuit I will need to get a pair of 1660s??
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The Lundahls are specified for 25 Hz to 40 KHz if gapped for 10 mA and driven by a 14K impedance. Since two sections of 6SL7 in parallel will be 22K, the low end (and likely high end) will be reduced. Not as bad as I would have anticipated, but 6SN7 would be a better choice.
Are your transformers gapped? If not, they may be only useful for push-pull or parafeed use. I could probably measure one with DC bias and see what they'll do... I have access to the necessary instrument, though it's currently out-of-house for calibration.
My ITs are air gapped. Using 6sn7 in the front end would be okay but would they work with my ITs? I have 5687, 7119 tubes and could go that way but would prefer to stay with octal tubes.
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