Edit: his response is that pin 1 is not tied to the chassis.
Boom.
Edit: his response is that pin 1 is not tied to the chassis.
Mission accomplished.
Then that confirms he doesnt have adequate electronics understanding. This is a very well known issue.I contacted the owner of VTV and his response is this:
“Yes there is no pin one problem. The chassis is ground led to earth and the modules audio signal is not. That is what Hypex directs.”
(I mistakenly did not specify Purifi in my email contact, but he ensured me in a follow up that it works the same)
I also purchased a Purifi amplifier from him with stock Hypex board, I haven’t received it yet.
I sent another email his way. He responds very quickly, I’ll give him that. It’s fairly late so I may not get a response tonight.
After seeing the internals, I’m a little bummed. If it is ground correctly, is the lack of twisted wiring and proximity of the boards to PSU enough to worry the amplifier will not function as intended?
Edit: his response is that pin 1 is not tied to the chassis.
I went to hypex and read their paper on pin 1 and they said it should ground to chassis.
https://www.hypex.nl/p/application-notes-white-papers/
Just curious, how is power turned on/off?Here is a picture of the VTV. With stock buffer it cost $900. Anyone care to comment on the build? It looks like scant attention has been given to cable dressing, but does that matter much in this case? Looks a little rough to me, but the price is compelling.
View attachment 59624
I’m curious what he will say. His response times are amazing, I have to give him that.There is an on/off switch on the back. I emailed for a RMA I'm sending it back, no reason I should fix this stuff. If I could do that I would build my own.
I’m curious what he will say. His response times are amazing, I have to give him that.
I hope it’s not in bad taste to post his responses, I don’t feel like they necessarily need to be private. I also linked to him our discussion in case he wanted to chime in himself.
Here’s what I was last told:
“
Yes the pin one problem is way bigger than that forum. I found this to be the lowest noise and risk of ground loop taking cable shield ground from the source.
By the way, earth ground to chassis is established through the IEC filter inlet’s outside case being in contact with the filed surface (anodize removed) of the chassis itself.”
I’m not claiming to be an expert in amplifier construction or electronics, so I’m trying not to jump to any conclusions either way. From what I’ve read, the proximity of the modules and PSU shouldn’t pose an issue (it’s not atypical, though that means little). If it’s correctly grounded, the only issue (potentially) appears to be what happened with pin 1?
Should these amps use an IEC filter? I recall reading something about it.By the way, earth ground to chassis is established through the IEC filter inlet’s outside case being in contact with the filed surface (anodize removed) of the chassis itself.”
Should these amps use an IEC filter? I recall reading something about it.
Thought so from looking at the picture. So you need easy access to the back to turn it on and off...... Mmmmm......There is an on/off switch on the back. I emailed for a RMA I'm sending it back, no reason I should fix this stuff. If I could do that I would build my own.
I’m curious what he will say. His response times are amazing, I have to give him that.
I hope it’s not in bad taste to post his responses, I don’t feel like they necessarily need to be private. I also linked to him our discussion in case he wanted to chime in himself.
Here’s what I was last told:
“
Yes the pin one problem is way bigger than that forum. I found this to be the lowest noise and risk of ground loop taking cable shield ground from the source.
By the way, earth ground to chassis is established through the IEC filter inlet’s outside case being in contact with the filed surface (anodize removed) of the chassis itself.”
I’m not claiming to be an expert in amplifier construction or electronics, so I’m trying not to jump to any conclusions either way. From what I’ve read, the proximity of the modules and PSU shouldn’t pose an issue (it’s not atypical, though that means little). If it’s correctly grounded, the only issue (potentially) appears to be what happened with pin 1?
No, Julf covered it.Should these amps use an IEC filter? I recall reading something about it.
Yep that is most definitely wired wrong . Pin 1 should go to chassis.Sorry to return to the subject of the Pin 1 Problem, but I could use a bit more clarification. I noticed that, in Archimago's infamous post, he doesn't seem to account for the Pin 1 Problem. If I read the above correctly, Pin 1 should be wired to the chassis and the cable shield can be soldered to "Pin 4," which is the silver prod on the top left corner. Is this correct? If so, would a short wire from Pin 1 to one of the nuts by it work?
View attachment 59946
http://archimago.blogspot.com/2020/01/an-inexpensive-hi-fi-class-d-stereo-amp.html
March Audio: every day I see that your amps are worth the price!!