How to model this? (LTSpice)

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Further to the thread below about the DC path to ground and the influence of its resistance on the AC behavior of the amp (especially the Coupling Cap and Grid Choke combination before the driver), I now added the bias supply in the simulation (above).

When doing an AC analysis on this, the AC behavior is completely different (compared to the version without the bias supply posted earlier).

It seems response is highly dependent on the Series Resistance of V7. In the simulation it's now set to 1meg, giving the result above.

These 'odd' results I always get are the reason I always maintain separate versions for AC and for Transient simulations. For some reasons my model of the power transfomers always seem to screw up AC analysis.

(by 'odd' I mean the 'dip' in the response around the very 'suspicious' frequency value of 100Hz).

Please help.

NC

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Parts Connexion

Topic - How to model this? (LTSpice) - Nickel Core 02:22:51 11/14/14 (14)

RE: How to model this? (LTSpice) - dave slagle 14:25:11 11/14/14 (1)

What I see is this... - Nickel Core 04:01:31 11/15/14 (0)

RE: How to model this? (LTSpice) - Triode_Kingdom 08:06:37 11/14/14 (1)

Yes, I do that too... - Nickel Core 08:09:22 11/14/14 (0)

RE: How to model this? (LTSpice) - dave slagle 05:28:59 11/14/14 (2)

RE: How to model this? (LTSpice) - Nickel Core 06:13:57 11/14/14 (1)

RE: How to model this? (LTSpice) - jazbo8 07:20:54 11/14/14 (0)

Bias supply - Chip647 05:11:39 11/14/14 (0)

RE: How to model this? (LTSpice) - jazbo8 03:24:25 11/14/14 (5)

Because... - Nickel Core 03:26:32 11/14/14 (4)

RE: Because... - Tre' 08:11:17 11/14/14 (3)

That gives... - Nickel Core 08:13:28 11/14/14 (2)

RE: That gives... - jazbo8 12:31:54 11/15/14 (0)

Odd - Tre' 08:19:09 11/14/14 (0)

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