• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Polystyrene capacitors

Is anyone familiar with NSF polystyrene capacitors? These all seem to have the "KF59" mark on them. I just bought an entire set of those caps, all are 2% tolerance 400V, going as high as 89800 pF, NOS presumably from the 60s-70s. The high voltage application is why I added this topic in the tube section.

Bought them in a lot with Philips mustards caps, and to be honest I'm only interested in those as my hobby is guitar and not Hifi. I'm planning on getting a fair price for the polystyrene caps where buyer is also very happy with, and give it entirely to the lady from which I bought the lot. She inherited it about 20 years ago from her father, and left it untouched in her garage.

Any help would be appreciated. Added some pics to see what I'm dealing with. 20240607_214335_copy_1020x765.jpg 20240607_214342_copy_1020x765.jpg 20240607_214351_copy_1020x765.jpg 20240607_214321_copy_1020x765.jpg 20240607_214316_copy_1020x765.jpg 20240607_214309_copy_1020x765.jpg
 

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Here's the final list. The series of 400V is close to 1000 parts. My OCD is good for the next couple of weeks.

There's a 350V batch high capacitance.

And then there's 500V with lower values.

PM me if interested in purchasing the lot. Like I said in the original post, I will not keep it to myself but surprise the woman with it through the mail, regardless of what it fetches.
 

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89800​
pF
6​
x
84800​
pF
5​
x
80000​
pF
5​
x
75600​
pF
4​
x
71400​
pF
4​
x
67300​
pF
3​
x
63600​
pF
4​
x
60000​
pF
4​
x
56600​
pF
5​
x
53400​
pF
4​
x
50400​
pF
3​
x
47600​
pF
3​
x
44900​
pF
2​
x
42400​
pF
2​
x
40000​
pF
2​
x
37800​
pF
3​
x
35700​
pF
2​
x
33700​
pF
2​
x
31800​
pF
2​
x
30000​
pF
2​
x
28300​
pF
2​
x
26500​
pF
2​
x
25200​
pF
2​
x
23800​
pF
3​
x
22400​
pF
2​
x
21200​
pF
5​
x
20000​
pF
5​
x
18900​
pF
8​
x
17800​
pF
9​
x
16800​
pF
5​
x
15900​
pF
4​
x
15000​
pF
3​
x
14100​
pF
5​
x
13300​
pF
5​
x
12600​
pF
5​
x
11900​
pF
7​
x
11200​
pF
4​
x
10600​
pF
5​
x
10000​
pF
5​
x
9510​
pF
5​
x
8980​
pF
7​
x
8480​
pF
27​
x
8000​
pF
19​
x
7560​
pF
4​
x
7140​
pF
5​
x
6730​
pF
5​
x
6360​
pF
5​
x
6000​
pF
4​
x
5660​
pF
2​
x
5340​
pF
6​
x
5040​
pF
5​
x
4760​
pF
4​
x
4490​
pF
9​
x
4240​
pF
8​
x
4000​
pF
22​
x
3780​
pF
13​
x
3570​
pF
17​
x
3370​
pF
14​
x
3180​
pF
12​
x
3000​
pF
13​
x
2830​
pF
17​
x
2650​
pF
12​
x
2520​
pF
15​
x
2380​
pF
9​
x
2300​
pF
5​
x
2240​
pF
7​
x
2120​
pF
36​
x
2000​
pF
5​
x
1890​
pF
8​
x
1780​
pF
10​
x
1680​
pF
11​
x
1590​
pF
30​
x
1500​
pF
12​
x
1410​
pF
10​
x
1330​
pF
7​
x
1260​
pF
4​
x
1190​
pF
7​
x
1120​
pF
9​
x
1060​
pF
6​
x
1000​
pF
13​
x
951​
pF
4​
x
898​
pF
7​
x
848​
pF
3​
x
800​
pF
7​
x
756​
pF
3​
x
714​
pF
5​
x
673​
pF
3​
x
636​
pF
4​
x
566​
pF
6​
x
534​
pF
2​
x
504​
pF
7​
x
476​
pF
4​
x
449​
pF
3​
x
424​
pF
7​
x
400​
pF
8​
x
378​
pF
9​
x
357​
pF
11​
x
337​
pF
6​
x
318​
pF
8​
x
300​
pF
1​
x
283​
pF
11​
x
265​
pF
16​
x
252​
pF
7​
x
238​
pF
7​
x
224​
pF
6​
x
212​
pF
10​
x
189​
pF
4​
x
178​
pF
5​
x
168​
pF
3​
x
159​
pF
25​
x
150​
pF
2​
x
141​
pF
5​
x
133​
pF
2​
x
126​
pF
3​
x
119​
pF
1​
x
112​
pF
1​
x
106​
pF
20​
x
100​
pF
1​
x
95​
pF
2​
x
90​
pF
1​
x
85​
pF
15​
x
80​
pF
3​
x
71​
pF
5​
x
68​
pF
18​
x
63​
pF
4​
x
59​
pF
3​
x
27​
pF
43​
x

400V