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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 24 Nov 2017, 21:53 
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Joined: 18 Nov 2017, 09:40
Posts: 5
Location: Michigan
I just killed a couple hours trying to scale Kuehnel's analysis of the Fender Bassman 5F6-A 12AY7 LTP to the 5964 or 6J6, and working through loadlines and rp estimation.

I took a guess that it might make sense to choose parameters for the smaller tube proportional to the % of 12AY7 plate dissipation. The Fender circuit loadline looks like 325 V for the plate supply and ~ 3.25 mA via 100k plate resistor (for each triode), so I chose 4 mA and 250 V and 62k plate resistors.

When I went through the rp graphical estimation near Vq/Iq, I was very disturbed to find I consistently had rp = 100k, nothing like the data sheet examples. This seemed like maybe I should start over with a totally different rationale, or lick the wounds I self-induced with the sharp end of a slide rule, and just build someone else's published circuit then alter it if needed. I've already forgotten what the second load line was that I intersected with the 250 V/4 mA line, but I was pretty low on the graph. I think this means my math was correct, but my initial logic for was a lousy one.

Nothing like crashing into the first parked car one chases...

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