Bottlehead Kits > Eros Phono
Eros-2: I built it my way
georgeged:
Just finished my Eros. Very happy with sound – very natural and warm. Thanks to all BH team for the great kit!
I made few changes / upgrades to stock kit:
1) Tube sockets are now premium machined Teflon
2) Most of MF resistors - Dale RN's, CF – Takman 0.5W
3) RIAA capacitors are matched within 1% tolerance to recommended values (I bought additional 10pcs of each value). 76.8K & 10.5K resistors (“ideal†values recommended by PJ) are Dale RN 0.1%
4) Almost all terminals (except 2 x 3-lug) are removed. I done it to make as less solder points as possible
5) Earthing is “star†type.
6) Most of hard wires are 1mm pure silver annealed silver wire (on the pictures the are in Teflon tubing; I had a piece from previous projects). Solder used is lead-free 4% silver.
7) Power supply: 270R resistor replaced with C-7X choke; instead of 100uf electrolytic cap now is 120uf PP film.
8) 0.1uf capacitors on Shunt Regulator board are now CDE 942C
9) Output capacitors are MIFLEX KPCU-01 Copper Foil, Paper/Polypropylene-in-Oil 1uf 600V
10) And finally, NOS tubes are: EF86 – Valvo, E88CC - Tesla Gold Pins, ECC82 - RFT
galyons:
Very nicely done!! :)
Cheers,
Geary
Paul Birkeland:
I think you will find that the RN60 27K cathode resistors you have installed will live a very short life (maybe a year) before the heat gets to them and destroys them. It's possible that this particular resistor used in that spot will also scorch the PC board.
The same goes for the 47K resistors on that board, though I would expect the 27K resistors to blow out a good chunk of time before these do. There are lots of fancy 2W rated parts you can get that fit here from Parts Connexion.
The same goes for the ~220K resistors on the shunt regulator board above the 12AU7.
georgeged:
PB:
--- Quote ---I think you will find that the RN60 27K cathode resistors you have installed will live a very short life (maybe a year) before the heat gets to them and destroys them. It's possible that this particular resistor used in that spot will also scorch the PC board. The same goes for the 47K resistors on that board, though I would expect the 27K resistors to blow out a good chunk of time before these do. There are lots of fancy 2W rated parts you can get that fit here from Parts Connexion.
--- End quote ---
PJ:
--- Quote ---The 47K resistor carries significant DC and should be metal; film is more practical than bulk metal or non-inductive wirewound. But no carbon, it's more likely to be noisy. A 1.75-watt rating is acceptable. It can be 5%.
--- End quote ---
I bought Takman REY 1W, but they didn't fit - leads are too thick. I will search for something which will fit.
I'm confused as to the correct power ratings for the Dale resistor ranges. I thought military grade RN60 or its industrial grade equivalent CMF60 is 1W@70°. 47K used is RN70/CMF70, which, as far as I know, is 1.75W. Am I wrong?
georgeged:
a couple more photos - the very beginning
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