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RE: Friend's Jolida 302B blowing fuses....why do they use fast blo fuses in this thing?!?

Posted by Paul Kehayas (A) on January 12, 2017 at 17:06:22

In Reply to: RE: Friend's Jolida 302B blowing fuses....why do they use fast blo fuses in this thing?!? posted by Tre' on January 12, 2017 at 16:43:46:

This is what was done to it when we modded it - these are Jim's words I am copying and pasting here...

1. replace the R17 & 18 1 Ohm 5 watt(!) resistors with
1 Ohm 1 or 2 watt.

2. Remove the 220uf/300 volt C6 & C7, replace with 680uf/250 volt
Panasonic ED. Save the 220/300, we'll reuse them.

3. Add (3) missing bypass caps, use .68uf GE MPP caps
(if the board doesn't have holes for them don't do it).

4. Replace C8 & C9 470/400 with 220/300 just removed

4a. (Option) Add .15 mh choke from in series with each B+
feed to the output transformers. If you don't add these chokes
leave the 470/400 caps in place

5. Replace stock diodes with UF5408 fast Vishay diodes

6. Replace the bias diode VD5 with a GI 856 fast/soft diode.

7. Replace R13 & R16 with 10K (or 1K if originally equipped)
carbon composition resistors

8. Replace the coupling caps - use .47uf/600 volt Rel-Cap
PPFX for C1 and .22uf/400volt K40 PIO (body insulated
from PC board) for C3 and C4.

Paul

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