DIY Holton Precision Audio power amp near me

[LP123]

Looking for used power amps. Found this DIY built Holton Precision Audio power amp near by. Thoughts?

Photos:

https://imgur.com/a/xQvuUD2

Seller's google-translated description:
"500w 8ohm - 800w 4ohm.

2 HPA-nxV800L ver 4.1 modules.

Holton Audio Power Controller R4.

HPA-SS/Relay One. Protects your speakers – works perfectly with power controller R4.

2000W transformer.

Per side: 80000uF Kemet on output stage and 4400uF Kemet on input. Decoupled with Jantzen 3.9uF capacitors.

There are both XLR and RCA inputs – it is adjusted to XLR on DC offset. Holton recommends that it is adjusted according to which input you are using. 1+3 must be connected in XLR if you want to use RCA.

There are certainly a lot more than what I'm selling for it. About 2-3X I'd say. "

 

[DVDdoug]

If you want to take a chance on someone else's DIY amp that's up to you. Personally, I'd want a very low cost-per watt. I bought a used amp a long-long time ago that MAY have been built from a kit (it was sold both ways). It was OK... until it wasn't... and eventually the parts were no longer available so I rebuilt it differently, and it still works!

it is adjusted to XLR on DC offset.

I have no idea what that means. Ideally there should be ZERO DC offset at the speaker outputs (and zero on the inputs too). With a good design it should stay at zero (or very near zero) with no adjustment. And most amps have DC blocking capacitors on the input so they can't amplify DC. Amps with a single power supply will have a DC blocking capacitor on the output, unless they are bridge amplifiers and then both outputs have the same offset for zero (differential) to the speakers.

Internal bias/offset, who knows?

 

[LP123]

If you want to take a chance on someone else's DIY amp that's up to you. Personally, I'd want a very low cost-per watt. I bought a used amp a long-long time ago that MAY have been built from a kit (it was sold both ways). It was OK... until it wasn't... and eventually the parts were no longer available so I rebuilt it differently, and it still works!


I have no idea what that means. Ideally there should be ZERO DC offset at the speaker outputs (and zero on the inputs too). With a good design it should stay at zero (or very near zero) with no adjustment. And most amps have DC blocking capacitors on the input so they can't amplify DC. Amps with a single power supply will have a DC blocking capacitor on the output, unless they are bridge amplifiers and then both outputs have the same offset for zero (differential) to the speakers.

Internal bias/offset, who knows?

I can get it for $850 maybe less. But yes it isn't my DIY so I can't truly know the build quality. What if I get it tested by a Hi-Fi tech shop? Or do you think there's no reason to pursue this at all?

I generally don't know much about the technicalities of amplifiers - so any advice is greatly appreciated.

 

[Sokel]

Not the best solderwork I have seen, that's for sure.
If you're not into DIY forget about it.

 

[LP123]

Thanks for the replies! I will not be pursuing the Holton amp. I am looking at the Densen B320 and PS Audio Stellar S300 instead. Both are used and cost around $800.