UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Diabolical Artificer · 23rd Sep 2019, 2:17 pm

Thanks Eddie, how you doing!? Good to hear from you and know your still out there alive and well : ) I'll have a butchers at that, just knocking up a few circuits on the bench.

"If it's a valve pre-amp you shouldn't need 100mA! A couple of mA possibly, which is why I suggested 5mA" It won't, I mentioned the 100mA in reference to the 3r3 resistor, which I know isn't fixed but is dependant on load. The preamp/PSU will power a phono stage and line amp, which will only draw 10mA tops, however there will be cathode followers after both of these IP stages to "drive" the connecting cable capacitance which may draw more than that. I havn't got to that bit of the design yet, so as the tfmr sec is 60mA I'm using that as my max capacity, but this isn't fixed in stone.

Andy.

23rd Sep 2019, 2:17 pm	#9
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,669	Re: HV regulation. Thanks Eddie, how you doing!? Good to hear from you and know your still out there alive and well : ) I'll have a butchers at that, just knocking up a few circuits on the bench. "If it's a valve pre-amp you shouldn't need 100mA! A couple of mA possibly, which is why I suggested 5mA" It won't, I mentioned the 100mA in reference to the 3r3 resistor, which I know isn't fixed but is dependant on load. The preamp/PSU will power a phono stage and line amp, which will only draw 10mA tops, however there will be cathode followers after both of these IP stages to "drive" the connecting cable capacitance which may draw more than that. I havn't got to that bit of the design yet, so as the tfmr sec is 60mA I'm using that as my max capacity, but this isn't fixed in stone. Andy. __________________ Curiosity hasn't killed this cat...so far. Last edited by Diabolical Artificer; 23rd Sep 2019 at 2:25 pm.