Riaa capacitor voltage ratings

mikemac · 9th June 2011, 05:25 AM

The Phono stage i am building, the Tetra specs capacitors in the RAII stage rated at B+ voltage. The RAII sits between the CCDA stages. I cant see that it will ever see B+, not even half. I am not sure tho and would like a second opinion. I would post a schematic but dont have one at hand

mikemac · 9th June 2011, 11:34 AM

getting no love on a couple of tetra questions.
Maybe stupid questions, maybe because it relates to a commercial site, maybe no one cares

DF96 · 9th June 2011, 11:39 AM

What voltage would the network see if all active devices were turned off? Probably full B+?

mikemac · 9th June 2011, 11:53 AM

here to learn. what active devices? the voltage comes of the cathode of the second half of the first stage. I really could do with some schooling, so don't hold back. i just don't see how say 260v anode thru the anode resistor thru the grid to the cathode and then another resistor could ever be equal to the B+

DF96 · 9th June 2011, 12:14 PM

Active devices are valves, transistors etc. You didn't say what devices you were using so I didn't jump to conclusions. If you can't work out what voltage would appear, then you will just have to trust the circuit designer. You need to think about devices being turned off (including valves before they have warmed up, or if a heater goes open circuit), or electrodes shorting together. Also whether there are other isolating components, and how much you trust them.

mikemac · 9th June 2011, 12:29 PM

if only i could post a schematic..i have a John Broskie Tetra Board, its a CCDA valve stage, bit like a DC coupled stage with a cathode follower. Just cant see how the B+ can get thru . Sorry to waste your time, i will figure it out

9th June 2011, 05:25 AM	#1
mikemac diyAudio Member Join Date: May 2010	Riaa capacitor voltage ratings The Phono stage i am building, the Tetra specs capacitors in the RAII stage rated at B+ voltage. The RAII sits between the CCDA stages. I cant see that it will ever see B+, not even half. I am not sure tho and would like a second opinion. I would post a schematic but dont have one at hand

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9th June 2011, 11:34 AM	#2
mikemac diyAudio Member Join Date: May 2010	getting no love on a couple of tetra questions. Maybe stupid questions, maybe because it relates to a commercial site, maybe no one cares

9th June 2011, 11:39 AM	#3
DF96 diyAudio Member Join Date: May 2007	What voltage would the network see if all active devices were turned off? Probably full B+?

9th June 2011, 11:53 AM	#4
mikemac diyAudio Member Join Date: May 2010	here to learn. what active devices? the voltage comes of the cathode of the second half of the first stage. I really could do with some schooling, so don't hold back. i just don't see how say 260v anode thru the anode resistor thru the grid to the cathode and then another resistor could ever be equal to the B+

9th June 2011, 12:14 PM	#5
DF96 diyAudio Member Join Date: May 2007	Active devices are valves, transistors etc. You didn't say what devices you were using so I didn't jump to conclusions. If you can't work out what voltage would appear, then you will just have to trust the circuit designer. You need to think about devices being turned off (including valves before they have warmed up, or if a heater goes open circuit), or electrodes shorting together. Also whether there are other isolating components, and how much you trust them.

9th June 2011, 12:29 PM	#6
mikemac diyAudio Member Join Date: May 2010	if only i could post a schematic..i have a John Broskie Tetra Board, its a CCDA valve stage, bit like a DC coupled stage with a cathode follower. Just cant see how the B+ can get thru . Sorry to waste your time, i will figure it out

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