Hello Phil
This is a ceramic (disc with nut/screw contacts?) high voltage capacitor.
"1278" is probably the date of manufacture (dec 1978)
"K15" is the type of the capacitor (ceramic high voltage, as I remember)
"n" is probably the cyrillic/greek letter "pi", so it is a 680 pF value
"60KBAP" mean 60 KVA Reactive power
"15Ka" this is the 15KV nominal voltage (that "a" is not an a, is the russian
"v")
"M1500" is the dielectric/ceramic type/temp factor.
I do not have full data about these russian K15 type capacitors.
Even if they are not the best for power RF (for this purpose the
mica type are better but more expensive), but are the most used for
HF power, including output blocking and power tank circuits as you need.
I saw many of them used at power HF in military equipment.
I used a 10nF/10KV blocking one for a pair of 4-400 at 3500
and it was ok, even it was the pulse type and had lower power rating.
Should be ok for what you need.
73,
Traian
Phil wrote:
> Does anyone know please, of where I can get some information on Russian
> capacitors? I bought some capacitors at Friedrichshafen earlier this year
> and they have the following markings:
>
> 1278 K15Y-I-680n +/- 20% 60KBAP15KaM1500
>
> Some of the symbols are no doubt in Cyrillic some apologies for any errors
> as my keyboard doesn't have the facilities for these symbols!
>
> My guess, is that this particular capacitor is 680pf at 15Kv. However, I'd
> be interested to know what current it could handle on the HF bands from 160m
> to 10m, as I plan to use a pair of these capacitors to form a blocking
> capacitor in an amplifier with 4Kv @ 1 amp on the anode of a GS35b.
>
> Any help or pointers in the right direction would be gratefully received!
>
> Cheers,
>
> Phil Smeaton
> G0HSS
>
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