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Classified Ads / Re: SAS Audio Labs 11A Line Preamplifier
« Last post by Nick B on Today at 08:54:22 PM »
Itís the first one Iíve seen for sale, Steve. Have maybe seen 1 or 2 of the 10As. Good luck on the sale.
Nick
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Classified Ads / SAS Audio Labs 11A Line Preamplifier
« Last post by steve on Today at 08:04:27 PM »
The last used SAS Audio Labs 11A that was for sale was some 5 years ago, in Europe.

It has been thoroughly checked over, new tubes installed.

This 11A has an extremely rare monitor section installed at manufacture
The only preamplifier on the planet that has an adjustment to compensate for different amplifier input impedances (Z) on the fly
Only Vampire all copper jacks are used.
An AC polarity switch (mute will function when flipped, ~45 seconds)
6 total power supply filter sections

The 11A is the most accurate/natural preamplifier in the world, regardless of expense. The 11A is the reference preamplifier by both Bound for Sound editor/publisher Martin DeWulf and by BFS reviewer Dr. Richard Weiner.

The 11A has been listening tested via multiple, including specialized types of listening tests for some 6 years before being marketed in 2005. It is the world's only truly accurate preamplifier. The 11A is specifically designed around new tubes, not NOS tubes.

Specifications (for this 11A) are given for those interested in such.

Frequency Response 20hz:                  < -0,015db, 25k load.
Frequency Response 20khz:                 < -0,0015db at 20khz, 100pf load
                                        
Gain:                                                  20db
Total Harmonic Distortion at 2 vrms:      0.015%, Approximately -78db or less (Min 18db less than with any 6SN7 or variant)
Channel Separation at 10khz:                90db typical
Signal Polarity:                                     Inverts
Input Impedance:                                 25k ohms (50k optional)
Output Impedance:                               1.9K (1900) ohms
Min. Amplifier Input Impedance:             25k ohms (20k ohms but with slight loss of bass)
Volume Controls:                                  2
Tape Loops, HT bypass:                         Optional
Line Inputs:                                           3 Basic Version (5 Standard version)
Preamp. Outputs:                                   2

Line Cord Length:                                  6 feet standard
Power Consumption:                              28 watts
Power Requirements:                             117/234 Volts AC, 50/60hz (120 volts, 0,25 amp slo-blo)
Dimensions:                                          19" front
                                                            4" high (with stock feet)
                                                            14 1/4" deep (counting knobs and jacks)

Condition good, gold knobs are little dingy from hands.

Asking $2,000 OBO.

Contact me vis PM or stevesammet at omnilec.com

Cheers

steve

3
Amplification and Preamplification / Re: 300B Mono blocks
« Last post by rollo on Today at 12:45:33 PM »
  Looking at Tektron. Can use a 2A3, 45 or 300B..

charles
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Home Grown Audio - 56 pieces
LOK Suregrip Spade Connector, gold 4mm

We have discontinued our cable products and no longer need these. Very high quality.

- 4mm hole for cable
- non-corrosive thick gold metal plating
- will never dull
- screw type fasteners for easy on/easy off
- spade will not slide due to grip pattern on fork

- Reg. $6.25 ea.

- Selling $165 for all 56 pieces ($3.00 ea.) - Shipping included in lower 48

5
Analog Devices / Re: need help re testing cartridge
« Last post by Nick B on August 07, 2020, 02:06:43 PM »
Thanks, Steve. The sale isnít quite concluded yet. Yes, enjoy your weekend as well. Am enjoying the cooling trend locally.....only 100 degrees today 🥵
Nick
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Analog Devices / Re: need help re testing cartridge
« Last post by steve on August 07, 2020, 01:45:37 PM »
Thanks, Steve. The pdf didnít display, but I was able to get ohm measurements and they were consistent for each channel. All I had available was a RX1K ohm setting. That Micronta is at least 25-30 years old. Had to clean those leads a bit :)
Nick

Hi Nick,

May have to contact Folsom about it, as the .pdf opens for me. I am using Firefox, do you have .pdf or firefox .pdf applications?
I could go .jpg and see how that works.

I used the Rx 200k, much higher ohmage to as to limit the current through the coil and movement of the cantilever.

Below is same diagram in .jpg .

cheers

steve

Steve,
I sent my results to the buyer. Will see what he says.
Thanks much,
Nick

Your welcome Nick. Glad all worked out for you.

I hope the newbies will save or print out this info for a later time.

cheers and great weekend Nick.

steve
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Analog Devices / Re: need help re testing cartridge
« Last post by Nick B on August 06, 2020, 11:12:17 PM »
Thanks, Steve. The pdf didnít display, but I was able to get ohm measurements and they were consistent for each channel. All I had available was a RX1K ohm setting. That Micronta is at least 25-30 years old. Had to clean those leads a bit :)
Nick

Hi Nick,

May have to contact Folsom about it, as the .pdf opens for me. I am using Firefox, do you have .pdf or firefox .pdf applications?
I could go .jpg and see how that works.

I used the Rx 200k, much higher ohmage to as to limit the current through the coil and movement of the cantilever.

Below is same diagram in .jpg .

cheers

steve

Steve,
I sent my results to the buyer. Will see what he says.
Thanks much,
Nick
8
Analog Devices / Re: need help re testing cartridge
« Last post by steve on August 06, 2020, 07:53:38 PM »
Thanks, Steve. The pdf didnít display, but I was able to get ohm measurements and they were consistent for each channel. All I had available was a RX1K ohm setting. That Micronta is at least 25-30 years old. Had to clean those leads a bit :)
Nick

Hi Nick,

May have to contact Folsom about it, as the .pdf opens for me. I am using Firefox, do you have .pdf or firefox .pdf applications?
I could go .jpg and see how that works.

I used the Rx 200k, much higher ohmage to as to limit the current through the coil and movement of the cantilever.

Below is same diagram in .jpg .

cheers

steve
9
Analog Devices / Re: need help re testing cartridge
« Last post by Nick B on August 06, 2020, 06:50:44 PM »
Thanks, Steve. The pdf didnít display, but I was able to get ohm measurements and they were consistent for each channel. All I had available was a RX1K ohm setting. That Micronta is at least 25-30 years old. Had to clean those leads a bit :)
Nick
10
Analog Devices / Re: need help re testing cartridge
« Last post by steve on August 06, 2020, 05:13:30 PM »
I found an overseas buyer for another mm cartridge I have, but he would like me to test it before shipping. As he didnít include the picture he promised, can anyone tell me what settings to use and how to confirm each channel works? Heíd like me to advise the ohm readings.

I was able to locate my Micronta tester

Thanks,
Nick

Hi Nick,

I will write from the stand point of newbies out there reading this, and may wish to use this information later.

I have a diagram, below, that I hope will help explain.

1. For MM DC resistance measuring, I would do an initial measurement of a very large resistor, say 100,000 ohms (100k).
"A" diagram show this. Digital meter leads either way to measure 100k resistor.

2. Set the digital meter to 200k ohm scale. The actual measurement will be a little off that, say 99,500 ohms, or it might read 100,100 ohms. A resistor never seems to read perfect 100,000 ohms. That is ok.

3. Write that reading down so as to remember the resistance. Let's say the meter reads 100,100 ohms.

4. Now look at "B" diagram. Using a clip lead, place a 100k resistor lead to the center pin as shown. Either lead is fine.

5. Now connect the other resistor lead to either meter probe with a clip lead as shown. Don't worry about which meter probe.

4. Now connect the other meter probe to the outside of the ic plug with a clip lead as shown in "B".

5. Set the meter to 200k scale and measure the resistance.

The resistance should Not measure 100,100 ohms, but some other value. As an example, my Accutex 320III STR moving
iron cartridge coils are 580 dc ohms. So the total DC resistance would be 100,100 ohms plus 580 = ~ 100,700 ohms.

What is important is that the total resistance changes from 100,100 ohms to 100,xxx ohms. If the meter reads infinite, then
either the cartridge coil is open, a bad solder connection, bad clip lead, or the ic itself.

I use a very high resistance in order to minimize the current through the coil. With my digital meters, and 100k ohms, the
current through the coil is 3 microamps (3 millionths of an amp).

6. Do the same for the other channel's ic.

Hope this helps all.

I just added the diagram in .jpg . Keep all diagrams and explanations in one post.

steve
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