Generic ASC files
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Generic ASC files
Place your generic files here as starting blocks for others.
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- 6SN7 LCL coupled.asc
- This is a LCL coupled 6SN7 which shows the same behavior as parafeed.
- (1.62 KiB) Downloaded 891 times
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- Posts: 2092
- Joined: Sat Jan 22, 2005 3:54 am
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a parafeed linestage with a 76 and a 2:1 output.
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- parafeed 76.asc
- The basic parafeed model.
- (1.91 KiB) Downloaded 931 times
Hopefully its of use, a standard three stage RIAA stage, with inverse RIAA on the input.
Usefull for finding the effect of changing the RIAA values.
Usefull for finding the effect of changing the RIAA values.
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- ThreeStagePhono.asc
- Three stage 12ax7 basic phono pre
- (4.96 KiB) Downloaded 1022 times
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- Posts: 2092
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14 step autoformer
LT spice file for the 14 step autoformer.
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- FORMER.ASC
- (6.52 KiB) Downloaded 989 times
Passive Inverse RIAA
A Passive Inverse RIAA made up from an RC network. The maths is courtesy of Jim Hagerman's paper "On Reference RIAA Networks" output can either be -40db or -60db.
cheers,
-- Andrew
cheers,
-- Andrew
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- passive_inverse_riaa.asc
- (1.15 KiB) Downloaded 846 times
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RCL coupled 6SN7
This allows easy changing of the L, C and cathode bypass.
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- 6SN7 RCL coupled.asc
- (2.2 KiB) Downloaded 1000 times
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Simple Bridge PS.
This is from Nickel Core over on the asylum. The discussion is about the cap across the secondary.
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- PSU2.asc
- (2.04 KiB) Downloaded 857 times
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a simple 12dB lowpass with some instructions
If you download LTspice and run this file you should get immediate results.
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- 12dB_Lowpass.asc
- basic file with some very basic instructions.
- (1.71 KiB) Downloaded 788 times
Distortion Cancellation in a SET
This file demonstrates the effect of distortion cancellation between driver and OP stages in a SET amp. The circuit is not intended to be an optimum design for DIY but highlights the benefit of finding well-matched tubes and careful selection of their operating points.
Since most of the distortion is generated by loading of the OP tube, less linear driver tubes operating at lower current tend to work best. The increased distortion created by these conditions is 180 deg out of phase with the OP giving rise to some cancellation, mainly in the lower harmonics.
In this DC coupled example, the local NFB caused by the OP tube's RK also plays a role to help completely cancel lower order harmonics. Change the operating points to see the effect using fft to view.
You will need the attached file dmtriodep.inc in case you don't have it.
Since most of the distortion is generated by loading of the OP tube, less linear driver tubes operating at lower current tend to work best. The increased distortion created by these conditions is 180 deg out of phase with the OP giving rise to some cancellation, mainly in the lower harmonics.
In this DC coupled example, the local NFB caused by the OP tube's RK also plays a role to help completely cancel lower order harmonics. Change the operating points to see the effect using fft to view.
You will need the attached file dmtriodep.inc in case you don't have it.
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- 2A3_Distortion Cancellation.asc
- (3.05 KiB) Downloaded 709 times
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- dmtriodep.inc
- (15.49 KiB) Downloaded 904 times
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Another setup...
A cap / IT coupled 3 stage amplifier where the bias is stepped in the driver stage to see if there are any harmonic cancellation effects in such a setup.
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- dist_cancellation.asc
- (3.75 KiB) Downloaded 688 times
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- dmtriodep.inc
- The file includes some models of less well known tubes like the Siemens Ba.
- (25.35 KiB) Downloaded 851 times
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Tuned Choke
Simple tuned choke file to look at the harmonics created.
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- tuned choke.asc
- (3.39 KiB) Downloaded 545 times
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