Eros Phono kit is in transit - any capacitor upgrades?
- Thread starter Henry2011
- Start date
The flaw in this deal is that you guys are perplexing over picofarads, but you aren't talking about measuring the preamp's response when you are done changing everything. What matters is that the preamp faithfully reproduces the RIAA curve, even over the precision of the value of the cap based upon theory. The value that keeps you within, say, 1/2 or 1/4 dB of the established curve is the correct value, even if it deviates a bit from the theoretical value. If you look at the notion of improving the preamp with these mods that way, the best resistors for the eq circuit will then be trimmers.
That said, our preamps are designed to be pretty faithful to the RIAA curve with the stock components.
That said, our preamps are designed to be pretty faithful to the RIAA curve with the stock components.
My goal in pursuing these mods is not to improve RIAA accuracy over stock. Rather, I'd like to squeeze the last bit of resolution out of this great circuit without harming the RIAA performance. I would love to measure performance if I had the tools and knowhow, but I don't. As best I can, I want to stick to the stock theoretical values since they sound great to my ears! I'm going with 0.1% foil resistors, so uncertainty in those values will be reduced by an order of magnitude. Thanks,Mika
Paul Joppa
Moderator
It's further out than I would like, but probably acceptable to most people.
Paul Joppa
Moderator
0.030uF.mwaller said:
So, I finally got around to installing some new parts in my Eros...
I replaced the output caps with V-Cap CuTF. In the RIAA network, I replaced the 0.01uf with selected pair of V-Cap TFTF caps and the 0.03uf with a selected pair of AudioCap RT (polystyrene). I also replaced the 47K input load and EF86 plate load resistors with Texas Components TX2575 "naked" foil resistors. Sounds great!
I'm noticing that the power transformer and aluminum chassis of the Eros get quite warm after a hour or so - almost too hot to touch. Is this normal? It's been so long since I listened to vinyl that I can't remember how it was before the mods...
Thanks,
Mika
I replaced the output caps with V-Cap CuTF. In the RIAA network, I replaced the 0.01uf with selected pair of V-Cap TFTF caps and the 0.03uf with a selected pair of AudioCap RT (polystyrene). I also replaced the 47K input load and EF86 plate load resistors with Texas Components TX2575 "naked" foil resistors. Sounds great!
I'm noticing that the power transformer and aluminum chassis of the Eros get quite warm after a hour or so - almost too hot to touch. Is this normal? It's been so long since I listened to vinyl that I can't remember how it was before the mods...
Thanks,
Mika
The tubes get nice and toasty, especially the 12BH7, as does the transformer. Consequently, the plate will be quite warm to the touch after it's been on for a while.
JamieMcC
New member
I'm looking ahead a bit here and am after a few pointers on favourite resistor brands for maybe later swapping out the stock 75K 1/2W and 47K 2W resistors :
I have liked the results of using the Vishay Dale RN series in the past for building attenuators but wondered what other makes you guys have been using.
TIA
I have liked the results of using the Vishay Dale RN series in the past for building attenuators but wondered what other makes you guys have been using.
TIA
Sjaakhuijsman
New member
Hello people
Here goes my first post.....reviving a cold topic :
I am waiting for my Eros phono and I read about the 0,47 uF cap, but I can't find it in the manual (parts list).
I find 0,01 and 0,03 uF for RIAA correction, 0,1 uF.....1,0uF.....1,5uF......10uF and so on.
What am I missing?
Greetings from Amsterdam
Here goes my first post.....reviving a cold topic :
I am waiting for my Eros phono and I read about the 0,47 uF cap, but I can't find it in the manual (parts list).
I find 0,01 and 0,03 uF for RIAA correction, 0,1 uF.....1,0uF.....1,5uF......10uF and so on.
What am I missing?
Greetings from Amsterdam
Sjaakhuijsman
New member
Thanx Tom! Very kind of you.
That would be the three 1uF ceramic capacitors of 50V used at the C socket.
I Can't see other 1uF capacitors used.
Am I right?
That would be the three 1uF ceramic capacitors of 50V used at the C socket.
I Can't see other 1uF capacitors used.
Am I right?
Sjaakhuijsman
New member
Ah...there is some difference between parts list (1,5uF 630V film cap) and the manual (picture) with 1,0uF MKP film cap....
Yes, we consolidated and send the kit with a 1.5uF cap instead of the 1.0uF cap. There is electrically no difference in the Eros circuit between the parts.Sjaakhuijsman said:
