01-08-2012, 08:26 AM
Thanks Robert,
I managed to get the 100uF caps fitted underneath the chassis so I have that space on top. As you mentioned about the complications when driving inductive loads from a capacitive dropper I tended towards the resisitive one at least until I could get the set to work.
As of last night it works great on shortwave (Radio China International was coming in loud and clear with no additional antenna) - I haven't checked it out on the other wavebands yet.
I was aware of the resistive wire shunting the dial bulbs and I replaced this with resistors I had on hand (2 x 100 Ohm 10watt in parallel) - this seems to be ok though perhaps a bit of a sledgehammer solution!
I'm very interested in the values you select for the capacitive dropper - for sure I will do the same later on. I had one attempt at calculating them so I guess now that I have a working set I can check key voltages and see if my calculations still apply.
It's great when one of these old sets starts to speak again after so many years being silent!
Cheers, John
I managed to get the 100uF caps fitted underneath the chassis so I have that space on top. As you mentioned about the complications when driving inductive loads from a capacitive dropper I tended towards the resisitive one at least until I could get the set to work.
As of last night it works great on shortwave (Radio China International was coming in loud and clear with no additional antenna) - I haven't checked it out on the other wavebands yet.
I was aware of the resistive wire shunting the dial bulbs and I replaced this with resistors I had on hand (2 x 100 Ohm 10watt in parallel) - this seems to be ok though perhaps a bit of a sledgehammer solution!
I'm very interested in the values you select for the capacitive dropper - for sure I will do the same later on. I had one attempt at calculating them so I guess now that I have a working set I can check key voltages and see if my calculations still apply.
It's great when one of these old sets starts to speak again after so many years being silent!
Cheers, John
Time flies like an arrow, fruitflies like a banana!
