Slewmaster Resources

Introduction

These are the resources for the Slewmaster series of builds
from ostripper. They are divided into two distinct threads, shown as:

Design thread, Slewmaster - CFA vs. VFA "Rumble"

LINK

Here are the builds and related post numbers provided by Thimios:

]Nad (CFA)look at post# 832,963,967.988,989,1005
Spooky (VFA)#1247,1267,1292,1301
Gnome v1.3(CFA)#1455,1467,1485,1500,1516,1531,1538,1567
Symasui (VFA)#1642,1671,1672,1673
Cfa ver.1.2(CFA) #1754,1756,1757,1784
Cfa v1.3(CFA) #2976
Wolverine((VFA) ver1-c #3543,3564,3637,2279
Kypton C (CFA)#4797,4765
Kypton V(VFA) #5261,5282
Eyessee (CFA)#5521
Kypton ND(CFA) #6830,6850,6888
Bimo-Ostriper Symetry(VFA) #8064,8066,8091
Infidel an unsuccessful IPS #5385

Ostriper schematic list look at post # 1

Build thread, Slewmaster Builds

LINK

It might be time to put the controversy to "rest'.
The only real way is to actually make some amplifiers.

The best way to start (I might be wrong) , is to assume that the simulator lies (slightly).

RNmarsh commented that many of his simulated (CFA) amps performed
much better when actually built and I have had VFA's that did not perform
as simulated.

DIYAudio allows first post editing, so ALL current work is posted there!

IPS - Input Stage

IPS - Separate small PCB's can plug in to the OPS. All IPS's will run off any supply the OPS provides. CFA and VFA IPS's can be interchanged ... as the operating voltages and currents are standardized.

OPS - Output Stage

OPS - Each Amp is composed of:
Output Stage
Capacitance multiplier (simple regulator).
The printed circuit boards (PCBs) are available as follows:
Pair
Power into 8 ohms
2 pair
70 watts
3 pair
150 watts
5 pair
250 watts

With premium output devices this could be nearly doubled.
Triple output stage topology is used, as well as a 2 device compound thermal
compensation circuit. Similar to the Harmon /kardon 680 -990 series
integrated amplifiers.

CFA - Current Feedback Amp

VFA - Voltage Feedback Amp

Below is the "lineup" .....

1-3. SLEWMASTER OPS's (V1.2 -3 of them) the "baby" , "master" and monster"
....3 power levels of EF3 goodness. POST(s) #500 , 502 , 504

4. NAD-S-v1.2 IPS (CFA) - Based on the excellent "NX" with servo DC and the Hawksford Cascode. Member NAF says "it sings" gracefully. Post #518

5. Wolverine-V1.2 IPS (VFA) - "blameless" based with PPM ultra low distortion.
Next logical refinement after the "Badger". POST #599


6. CFA-X and "XH" (CFA , of course) - Similar to the "VSSA/peeceebee" , a very simple amp usable
with the "slew" OPS's. POST #701 -perfected (684 is an error - do NOT use ! )
Edit ... post #2739 is the official schema for the "new" version for CFA-X "H" (hawksford powered).

7. Spookyamp (VFA) Based on the 2500$ Harmon kardon 990 receiver ... uses the classic
Georgia Tech "Leach" topology. Post #803 V1.1 ...

8. Symasui (VFA) - the DIYA "symasym" on steroids post #1628 , almost forgot this one .... Post #1628

9. Kypton-C (CFA) - better CFA-X with servo and super-pair. Post # 4729.

10. Kypton -V (VFA) "classic sansui" 3 stage IPS. Post # 5384.

11. EYESEE (CFA) - IC based amp .....post #4944

12. "Infidel" V2 (VFA) - Fast ... Fast !! with kV slew capability. - #5753

More to come ...
ENJOY!
OS




Slewmaster is based on a common core of amplifier sections.

Amp Boards

Each post ,(#500,502,504) has the unified 2p/3p/5p schema in the
attached zip file. First post lists these posts ....

Input Board

Output Board

The latest version of the output board is being designed by OS and
laid out by JKuetemann as this is being posted. LINK


Features of the design include either BJT or FET output devices.
and it will work with up to five matched output pairs.
Below is the recommended location for for using the
output devices.

5
-5
4
-4
3
-3
2
-2
1
-1

2 pair
3 pair
4 pair
5 pair

Protection Board

These sections are contained

Bill of Materials - BOM

The BOM has the list of parts you need to buy.
Here is an excel spreadsheet with the various
build parts on it. Across the bottom of the the
page are separate folders for each build type.

Let someone know if there is a problem as
this is a group process, group build, trouble
shooting etc. There are a lot of folks that
will help you out if you have a problem.

Good luck Jim, this thread will self destruct
in five seconds.

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