Interesting simple tone control circuit. - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Herald1360 · 12th Jun 2016, 2:50 pm

I'm not generally using LTSpice except for some LT related stuff at work. I've got an oldish version of Simetrix to play with at home which I've tried various Ge device models in but hadn't found a realistic one yet. For tone controls etc I'm quite happy to use 2N2222 for NPN or whatever default small signal PNP transistor pops up.

Valve models are also of interest!

I had just seen the AC128 in the sim schematic and was curious about its provenance. It was obviously being used as a sub for the OC71 in the original circuit.

ukcol · 13th Jun 2016, 10:21 am

Thanks for going to the trouble of running a simulation of the second circuit Peter, it makes an interesting comparison.

12th Jun 2016, 2:50 pm	#21
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: Interesting simple tone control circuit. I'm not generally using LTSpice except for some LT related stuff at work. I've got an oldish version of Simetrix to play with at home which I've tried various Ge device models in but hadn't found a realistic one yet. For tone controls etc I'm quite happy to use 2N2222 for NPN or whatever default small signal PNP transistor pops up. Valve models are also of interest! I had just seen the AC128 in the sim schematic and was curious about its provenance. It was obviously being used as a sub for the OC71 in the original circuit. __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

13th Jun 2016, 10:21 am	#22
ukcol Rest in Peace Join Date: May 2003 Location: Harlaxton, Lincolnshire, UK. Posts: 3,944	Re: Interesting simple tone control circuit. Thanks for going to the trouble of running a simulation of the second circuit Peter, it makes an interesting comparison.