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DC coupled single ended cathode follower 6SJ7/6V6 amp project
DC coupled single ended cathode follower 6SJ7/6V6 amp project
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Old 27th July 2019, 06:07 PM   #91
Dinolobe is offline Dinolobe  Canada
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I measured my output transformers and adjusted the values accordingly into the simulation. The result is a half square half sine wave with unequal spikes everywhere. Do I get those results because the circuit doesn’t fit the OPTs or because I have to enter appropriate values in order for the simulation to work properly ? Here are the measurements :

Primary : 225 dcr / 5k ohm / 2.26Hy
Secondary : 0.01 dcr / 8 ohm

Inductance measured with cheap LCR meter, I am not shure if I can trust the results, especially when considering that the simulation has a 1khz input signal and the tester probably only does DC...
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Old 27th July 2019, 09:01 PM   #92
piano3 is offline piano3  United Kingdom
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You can't measure iron cored inductors with a multi-meter; you need to apply known AC voltages at known frequencies, measure the currents and calculate inductance using the formula for inductive impedance.
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Old 28th July 2019, 12:54 PM   #93
rongon is offline rongon  United States
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DC coupled single ended cathode follower 6SJ7/6V6 amp project
You should be able to get a decent simulation using a pre-existing model of an OPT that's similar to the one you'll be using.

A few years ago, someone contributed an Excel spreadsheet with a good number of useful OPT models, which I've been using for simulations. (Whoever you are -- Thank you!) It won't get you an *exact* sim of your circuit, but it will allow you to get close. Once you have a simulation that looks good to you, build it and do the necessary tweaking.

I've attached the Transformer Models Rev4.xls file in a zip. I hope it proves useful.
--

PS - There's a discussion of OPT models for LTspice on the Intact Audio site:
:: View topic - Drop down transformer models for LTSpice
--
Attached Files
File Type: zip Transformer Models Rev4.zip (64.7 KB, 6 views)

Last edited by rongon; 28th July 2019 at 01:02 PM.
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Old 28th July 2019, 05:35 PM   #94
jhstewart9 is offline jhstewart9  Canada
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Default Summary of Triode Output Stage

This article should help. All summed up well in the last two paragraphs.
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