I no longer offer refurb kits. Capacitor substitutions may be done in regard to voltage ratings as long as they are rated higher than the rated voltage of the part being replaced.
The 450 volt 82 or 100 uf capacitor should be of good quality as the voltage on it approaches the maximum voltage rating and some of the inexpensive Chinese capacitors will fail prematurely that I have experimented with. I’ve seen anywhere from 430 to 445 volts on the B+ after removing the tube rectifier and replacing with 1n4007’s. I’ve had no failures of the Kemet labeled capacitors so far, even after many days of burn in when I was checking frequency stability of the crystals. The less expensive capacitors would fail usually with less than 24 hours of burn in in the HV circuit. The other “cheap” electrolytic capacitors that I have used have not failed.
If you find your B+ is very close to or exceeds 450v and want to reduce it, you might try loading it with a 180 or 220K ohm 2 watt resistor to ground. Those are suggested values and it might require a higher or lower value resistor.
| Quanity | Value | Unit | Type | Rating | Description |
|---|---|---|---|---|---|
| 2 | .1 | uF | Polypropylene | 630 vdc | C34, C64 - refurb part 104J |
| 1 | .047 | uF | Polypropylene | 630 or 400 vdc | C25 - refurb part 473J |
| 1* Optional- Included in refurb kit. | .47 or .5 | uF | Polypropylene | 630 or 400 vdc | *C56 (not required to be changed unless you plan to use dc )power source) .47uF supplied - refurb part 474J |
| 1 | 100 or 82 | uF | Electrolytic | 450 vdc | C59 - Use good quality for this one |
| 1 | 4.7 | uF | Electrolytic | 400 or 450 vdc | C3 (in One) C28A (in TWO dial section) replaces 4 uFsection |
| 1 | 10 | uF | Electrolytic | 250 vdc | C4 (In One) C28B Iin Two dual section) replaces 8 uF section) |
| 1 | 22 | uF | Electrolytic | 400 or 450 vdc | C33 (replaces 15 uf in multi-section) |
| 1 | 10 | uF | Electrolytic | 250 vdc | C33 (replaces 10 uf 150 vdc in multi-section) |
| 1 | 10 | uF | Electrolytic | 25 vdc | C33 (replaces 10 uf 25 vdc in multi-section) |
| 2 | 1N4007 | Diode | 1000 vdc | Replaces 12BW4 or 6BW4 Tube | |
| 1 | 390 | Ohm | Resistor | 5, 3, or 2 watt | R48 - Johnson 10 meter manual specifies 2 watts. Can use 330 ohm. 3 watt metal oxide in kit. Wirewound, Metal Oxide or other types acceptable. |
| 1 | .33 or .47 or .5 | uF | Polypropylene | 630 vdc | .33 uF paralleled across R48 in 10 meter version. Can sub .47 or .5 uf in it's place. .47 supplied - refurb part 474J |
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