Generic ASC files

LT spice, Curve Captor, PSUDII and whatever other sims you can think of.

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dave slagle
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Generic ASC files

Post by dave slagle »

Place your generic files here as starting blocks for others.
Attachments
6SN7 LCL coupled.asc
This is a LCL coupled 6SN7 which shows the same behavior as parafeed.
(1.62 KiB) Downloaded 817 times
dave slagle
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Post by dave slagle »

a parafeed linestage with a 76 and a 2:1 output.
Attachments
parafeed 76.asc
The basic parafeed model.
(1.91 KiB) Downloaded 843 times
nickg
Posts: 29
Joined: Sat Mar 19, 2005 1:46 pm

Post by nickg »

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.
Attachments
ThreeStagePhono.asc
Three stage 12ax7 basic phono pre
(4.96 KiB) Downloaded 940 times
dave slagle
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14 step autoformer

Post by dave slagle »

LT spice file for the 14 step autoformer.
Attachments
FORMER.ASC
(6.52 KiB) Downloaded 915 times
Andrew
Posts: 201
Joined: Wed Apr 26, 2006 8:06 am

Passive Inverse RIAA

Post by Andrew »

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
Attachments
passive_inverse_riaa.asc
(1.15 KiB) Downloaded 774 times
dave slagle
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RCL coupled 6SN7

Post by dave slagle »

This allows easy changing of the L, C and cathode bypass.
Attachments
6SN7 RCL coupled.asc
(2.2 KiB) Downloaded 914 times
dave slagle
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Simple Bridge PS.

Post by dave slagle »

This is from Nickel Core over on the asylum. The discussion is about the cap across the secondary.
Attachments
PSU2.asc
(2.04 KiB) Downloaded 781 times
dave slagle
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Joined: Sat Jan 22, 2005 3:54 am
Location: NYC
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a simple 12dB lowpass with some instructions

Post by dave slagle »

If you download LTspice and run this file you should get immediate results.
Attachments
12dB_Lowpass.asc
basic file with some very basic instructions.
(1.71 KiB) Downloaded 710 times
Naz
Posts: 71
Joined: Wed Aug 06, 2008 4:27 am
Location: Sydney Australia

Distortion Cancellation in a SET

Post by Naz »

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.
Attachments
2A3_Distortion Cancellation.asc
(3.05 KiB) Downloaded 626 times
dmtriodep.inc
(15.49 KiB) Downloaded 827 times
Nickel Core
Posts: 14
Joined: Wed Sep 26, 2007 8:52 pm

Another setup...

Post by Nickel Core »

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.
Attachments
dist_cancellation.asc
(3.75 KiB) Downloaded 619 times
dmtriodep.inc
The file includes some models of less well known tubes like the Siemens Ba.
(25.35 KiB) Downloaded 776 times
dave slagle
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Joined: Sat Jan 22, 2005 3:54 am
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Tuned Choke

Post by dave slagle »

Simple tuned choke file to look at the harmonics created.
Attachments
tuned choke.asc
(3.39 KiB) Downloaded 469 times
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Naz
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Joined: Wed Aug 06, 2008 4:27 am
Location: Sydney Australia

Post by Naz »

Dave, this is consistent with my findings in the real and Simmed world. Definitely worth a try and perhaps some experimentation with lower C and L values.

Naz
Attachments
Tuned Choke.JPG
Tuned Choke.JPG (151.22 KiB) Viewed 11457 times
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