John Curl's Blowtorch preamplifier part II

[leapcat]

Originally Posted by simon7000

Wow PDF is screwed up showing Holco and Mills but Resista only shows label not graph!

Resista graph is almost mind blowing!

Odd, pdf matches word doc I get from download.
Sorry about that.

[john curl]

Thanks for trying, Leapcat. We can't win them all, and now we have the results.

[simon7000]

Originally Posted by leapcat

Odd, pdf matches word doc I get from download.
Sorry about that.

Blame it on Microsoft, they deserve it.

[Joachim Gerhard]

Röderstein did amasing parts. Try the KP1822 capacitor if you can get them.
Simon, i could send you some Dale RS55 unmagnetic if you like.

[john curl]

Interesting, isn't it?

[Steve Eddy]

Wait a minute.

The resistors were supposedly a Holco, a Resista and a Mills. But the third resistor is given as a "PRP 9372." I can only find this number associated with Precision Resistive Products. It doesn't match anything made by Mills.

So which is it? Is it a PRP resistor or a Mills resistor?

se

[john curl]

Simon, we should try more Resista resistors, perhaps that was an accidental making. The new Resista resistors should be much like the Dale. Michael Percy might be able to sell you a few OLD units. Use my name, when you ask, and insist on only OLD stock.
The PRP 'should' be a good wirewound, but you never know.

[jacco vermeulen]

Originally Posted by Joachim Gerhard

Röderstein did amasing parts. Try the KP1822.

Are you sure about that number, not a typo ?
My oldy Roederstein catalogs do not mention it, best Roe caps i traced in the 1980s were the radial Ero KP1830 for values up to 33nF and the axial Ero KP1832 for larger up to 0.68uF.

Seems odd that Roederstein manufactured an identical KP series number along with the MKT1822, not exactly "heimatlich".

[ikoflexer]

Originally Posted by john curl

Simon, we should try more Resista resistors, perhaps that was an accidental making.

Definitely a good idea. While promising, experiments with a sample of one aren't very convincing.

[simon7000]

Originally Posted by Steve Eddy

Wait a minute.

The resistors were supposedly a Holco, a Resista and a Mills. But the third resistor is given as a "PRP 9372." I can only find this number associated with Precision Resistive Products. It doesn't match anything made by Mills.

So which is it? Is it a PRP resistor or a Mills resistor?

se

Steve,
You only read the fine print on the first 2 graphs, I did not show the PRP. Please send my usual consulting fee for more data!

John,
I did get the vintage Resista from M Percy. I have 10 samples. For most of the others I get some samples as bulk and some as tape/reel that way I know they were not all produced at the same time. I have some Yaego's 1/4 W MF 1% with the same part number but some are marked "China" and the others "Taiwan". They do not measure the same.

Most resistor types measure better with increase in wattage rating. That is why the Mills is so interesting. It may be shedding light on wire/cable distortion!

The Vishay Dale military style large body Metal Films come in 25, 50 and 100 PPM. I have lots of variants, After completing the runs on all of the samples I will remeasure some of them to confirm the results are the same from start to finish. A quick retest is the same.