On 04/04/2025 22:07, Tom Smith via groups.io wrote:
I measured the voltage on the HC6 socket and found negative .1 volts on one side and zero on the other.
Tom,
Hopefully that has not damaged the Progrock.
But I'm fairly sure the output of the Progrock has a positive voltage on it.
I suggest you try with a series capacitor, maybe 10n.
Then no damage is likely.
Of the two connections on the crystal socket one is used to inject the Progrock's output, maybe to the grid of a valve (tube). The series capacitor will be inserted here.
The other one must be disconnected and supplied with your 5 volts for powering the Progrock. Did you do this?
73 Alan G4ZFQ
