I would like to insert a small choke in front of resistor R109 for additional filtering of the power supply at the input stage. I am thinking of the Hammond 158L rated at 15H and 75mA at 411 Ohm DCR. Would a substitution of the resistor to one whose value is 1.1K work? This would give a total value of 1.5K (411 + 1100=1511 Ohms) as initially intended.
If the answer is yes, I figure that the $50 dollars spent on the 2 chokes should (emphasis on "should") offer a decent improvement. What do you guys think?
If the answer is yes, I figure that the $50 dollars spent on the 2 chokes should (emphasis on "should") offer a decent improvement. What do you guys think?
That choke has too much DCR for the currents that the SPP needs. Even if you bypass it with a resistor like that, it will still see ~125mA. It will also diminish the choke's effect.
A common choice for a budget choke is the Triad C-14X (6H, 200mA, 150ohm) from Allied. It's only $16, has the same DCR as the resistor it replaces, and can handle the current required.
A common choice for a budget choke is the Triad C-14X (6H, 200mA, 150ohm) from Allied. It's only $16, has the same DCR as the resistor it replaces, and can handle the current required.
Hi Russ,
Thanks for your reply, but you probably misunderstood what I am looking to do. Besides the main power supply choke which could be the Triad, I am trying to put another filtering stage in front of the input/driver stage. If you look at the schematic, cap C102 is the last filter cap that the the small signal tubes see and along with R102, they form a second filtering stage. I would like to insert the small choke in parallel with R102, and reduce that resistor's value to 1.1K so that the total resistance across this choke-resistor pair remains at 1.5KOhms. Do you think this would be worthwhile sonicwize given the relatively small outlay?
Thanks for your reply, but you probably misunderstood what I am looking to do. Besides the main power supply choke which could be the Triad, I am trying to put another filtering stage in front of the input/driver stage. If you look at the schematic, cap C102 is the last filter cap that the the small signal tubes see and along with R102, they form a second filtering stage. I would like to insert the small choke in parallel with R102, and reduce that resistor's value to 1.1K so that the total resistance across this choke-resistor pair remains at 1.5KOhms. Do you think this would be worthwhile sonicwize given the relatively small outlay?
There is only about 8mA going through there. That is a very large choke for that job.- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.