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Old 4th January 2007, 04:57 PM   #21
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Quote:
Originally posted by Nelson Pass


OK....

Everything else can be built with these.


Praying for it

Found the bootstraped twin-T in THE ART OF ELECTRONICS
Hmmmm . . .
The schematic looks simple tho . . .
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Old 4th January 2007, 08:19 PM   #22
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Quote:
Originally posted by Nelson Pass
[snip]Multimeter - RADIO SHACK FOR $39 (think about a couple of these)

Soldering Iron - RADIO SHACK FOR $19

Variac - MARLIN P JONES FOR $39

Scope - ANYTHING DECENT you can get used.
1 MHz, 5 mV, dual channel, a trigger that works.

Everything else can be built with these.


... says the man with an AP in very room.
But yes, you can built pretty good amps with these tools, (plus a signal generator, perhaps) if you know how to use them best.

Jan Didden
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Old 4th January 2007, 08:41 PM   #23
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You build the signal generator and the distortion analyzer
at the same time, and use them to test each other.

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Old 4th January 2007, 09:47 PM   #24
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As a personal preference, I like a faster scope; one fast enough to see any HF oscillation.

My favorite was the original Tek 475; last I checked, a new CRT was prohibitive though. And whilst I'm sharing biases and prejudices, I'd avoid the early digital scopes like the plague. Inadequate sampling rates and poor firmware made aliasing a real problem.
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Old 9th January 2007, 01:49 AM   #25
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Quote:
Originally posted by Nelson Pass


You build the signal generator and the distortion analyzer
at the same time, and use them to test each other.



Then, this good enuf (20-20K Hz)?
Thanks
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File Type: jpg distortion meter.jpg (44.7 KB, 2933 views)
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Old 9th January 2007, 01:53 AM   #26
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Hi Babowana,
Quote:
Then, this good enuf (20-20K Hz)?
Yes, I'm currently using an LDM-171. Bought it brand new years ago.

-Chris
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Old 9th January 2007, 02:57 AM   #27
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Thank you very much, Chris.
I will buy 171 or 170 whichever is available in the shop
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Old 9th January 2007, 09:13 PM   #28
anatech is offline anatech  Canada
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Hi Babowana,
I had to redo the capacitors in the power supply, so that might be your first project. Don't increase the size.

-Chris
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Old 10th January 2007, 02:04 AM   #29
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Quote:
Originally posted by anatech


I had to redo the capacitors in the power supply, so that might be your first project. Don't increase the size.

-Chris

Understood.
Any good reason for that redoing?

By the way, the shop informed that only LDM-170 is available.
But, I found the price is too high to be a second hand tool.
If she does not lower the price, I should find another shop.

Tks, again
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Old 10th January 2007, 02:54 AM   #30
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God help me, but I just broke my budget and bought one of these:

http://tinyurl.com/ybjpvt

What sort of hi-fi nut spends more money on test equipment than he does on actual audio gear? A DIY-er, of course! I couldn't hope to win the bid on a Heathkit AA-1800 power amplifier, not when I wanted this analyzer, too. The IMD capabilities are what grabbed my interest.

I guess I'll have to sell my two Heathkit distortion analyzer to help pay for this excess, but that's what Ebay is for, yes?

There are three of these Tektronix test sets left.
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