*not quite necro* This post is a copy of what I posted on Head-Fi (my first post).
Today I upgraded the caps in my Aune T1. In my searches through the Head-Fi
thread I've seen some questions about what the stock caps actually are.
Here's what my stock caps were:
Main primary power supply caps (C35, C36): Lelon RXW-series 3300uF 25V (
datasheet PDF) - decent specs, but too high capacitance to measure with my LCR to confirm
Secondary caps (C55, C56): Panasonic FC-series 330uF 35V (
datasheet PDF) - good caps, measure low-ESR in my LCR
Amp board rail voltage caps (C51, C59): Nichicon VR-series 470uF 25V (
datasheet PDF) - good caps, measure low-ESR in my LCR
Amp board coupling caps (C32, C52): Elna RJ3-series 100uF 25V (
datasheet PDF) - good caps for GP usage
As for the red film caps, things got a bit interesting.
Caps marked u1J63: (C33/34/53/54, amp C50/58) 0.1uF 63V 5%, appear to be Wima MKS-2 series, but terrible ESR measurements! (all 6 tested the same)
100Hz: 27.3 ohms
1KHz: 6.8 ohms
10KHz: 1.59 ohms
100KHZ: 0.36 ohm
Caps marked 1uK63: (C16/46/47) 1uF 63V 10%, likely Wima MKS-2 series, ESR tests fine
100Hz: 1.7 ohms
1KHz: 0.58 ohms
10KHz: 0.15 ohms
100KHz: 0.04 ohms
The caps marked as Wima 0.47uF 100V seem to be proper 5% MKS-2 series and ESR tests are in line with the smaller MKS-2 0.47uF 63V 5% caps I got, so I left them in.
I followed the PDF guide from Mikoss (on Head-Fi) for replacements (much thanks!) of the electrolytics. For the Wimas I used MKP-2 for the 0.1uF and MKS-2 for the 1uF (no 1uF MKP-2's). All caps received extra insulation with Kapton tape where they contact any other components (C56 got more as it almost touches the tube socket leads).
Wima MKP-2 0.1uF 100V 5%: Huge improvement!
100Hz: 0.4 ohms
1KHz: 0.19 ohms
10KHz: 0.02 ohms
100KHz: 0.02 ohms
Wima MKS-2 1uF 63V 5%: - similar measurements as the smaller original caps, but benefit from 5% tolerance
100Hz: 2.1 ohms
1KHz: 0.61 ohms
10KHz: 0.15 ohms
100KHz: 0.04 ohms
Stock pcbs and new caps: Elna Silmic II for secondary power supply and amp board, Panasonic FR for primary power supply filtering, Wima MKP-2/MKS-2 film caps where needed
Primary caps:
Hey, where's the Wimas!: so much more room for the Silmics though
Wimas moved to other side of pcb: plenty of room for all
Main pcb done: not bad!
Amp pcb done:
Assembled component side: had to trim the RCA board's jumper wire connectors to clear the caps
Assembled socket side: looks like it was meant to be!
I had to further attach the RCA wiring with Kapton tape so the bottom lid would close properly.
I still need to run this thing to allow the caps to settle, but so far it's quite nice. I dropped my gain from 6dB to 0dB, as it was a bit harsh. Stock 6922EH works well, but I want better!