Last edited:
I see now, Nicoch58 uses a DPST. This is so complicated! 😛
Nicoch58, you are quite clever.
Jamayfie: No, but with two SPST, I think.
Nicoch58, you are quite clever.
Jamayfie: No, but with two SPST, I think.
Last edited:
Having to use the amp with some elderly Focal floorstanders while the ESLs charge up - they've been idle for over a year and one is protesting slightly.
I'm expecting great things, partly because the Focals have never sounded so good, (I might even award them a crossover upgrade!) but also because the presentation with a Roksan pre-amp is so much lighter all round than the Cyrus back home. I must finish re-casing the WHAMMY and the Korg Nu-Tube asap, plus a couple of others in the pipeline, because they've suddenly become crucial. Improving the clarity and micro-detail of one component immediately spotlights the next. What's the latest 'best ever' DAC under £1000 these days? (Rhetorical)
I'm expecting great things, partly because the Focals have never sounded so good, (I might even award them a crossover upgrade!) but also because the presentation with a Roksan pre-amp is so much lighter all round than the Cyrus back home. I must finish re-casing the WHAMMY and the Korg Nu-Tube asap, plus a couple of others in the pipeline, because they've suddenly become crucial. Improving the clarity and micro-detail of one component immediately spotlights the next. What's the latest 'best ever' DAC under £1000 these days? (Rhetorical)
I meant keep a DPDT in the original position and add a SPST in the new position (red in the modified schematic). But the jumpered version with a single switch is cleaner!
I've only been casually following this switch/relay fun so forgive me if it's been addressed.
Wouldn't the relay require a diode? Most circuits I've seen with a relay have a diode to protect currents flowing when de-energizing rapidly.
Wouldn't the relay require a diode? Most circuits I've seen with a relay have a diode to protect currents flowing when de-energizing rapidly.
Try the Khadas Tone Board 1. Uses ESS9038 - truly great sounding. Don’t let the low cost dissuade you.
The Tone Board 2 has a mini chassis and selector knob and balanced output for a little more.
Here's a link to the DPST switch: GRS-4021-0004 CW Industries | Mouser
Not sure about the power connector.
Not sure about the power connector.
This is the same part that I used to re-wire the power distribution inside my VFET amp to accommodate the external dual mono linear supply that I built.
https://www.mouser.com/ProductDetail/Kycon/KPJX-PM-4S?qs=zorda86t5M/dp%2BTtr6by2g==
https://www.mouser.com/ProductDetail/Kycon/KPJX-PM-4S?qs=zorda86t5M/dp%2BTtr6by2g==
Thanks for the recommendation: I'll have a look at those, although the preamp will probably be my first 'upgrade'. The Maverick Tubemagic I have at the moment is sounding superb - having discovered how sensitive the VFET is, I'm using the tube, as opposed to the upgraded op-amp output and it's excellent.
The constant feed is Radio Paradise via a laptop, so not exactly hi-res. I wouldn't describe something that keeps stopping me in my tracks as 'background', though.
The ESL57s have never sounded this good, with ample volume in a medium sized living room. Happy Days!
hi.
amplifier number 194 is finished and running.
does anybody have any humm with his amp?
mine has some humm. not very loud but…
thx
amplifier number 194 is finished and running.
does anybody have any humm with his amp?
mine has some humm. not very loud but…
thx
So far there have been no other reports of hum from either of the new VFET amps. The nature of the SMPS power supply makes this very unlikely.
More likely is that there is an issue with the grounding scheme of your preamp.
More likely is that there is an issue with the grounding scheme of your preamp.
with all my other amps and my preamp i have no humm.
strange.
the humm is not loud but audible.
hmmm… any idea?
strange.
the humm is not loud but audible.
hmmm… any idea?
#179 is up and running! Though I did have doubts that I might have fried the outputs when I discovered the relay was keeping them shunted. I haven't decided how or whether to deal with that.
I'm measuring a little less distortion than in the graphs. Slightly under 1.5% at ~10.7W into 8 ohms, either channel. Input is 2.7Vrms then.
Sounds great too! (No hum, though I do have a Jensen isolation transformer ahead of it, just because it was already in the system.)
I'm measuring a little less distortion than in the graphs. Slightly under 1.5% at ~10.7W into 8 ohms, either channel. Input is 2.7Vrms then.
Sounds great too! (No hum, though I do have a Jensen isolation transformer ahead of it, just because it was already in the system.)
