Author Topic: GECO AUDIO - vanguard power amp  (Read 17222 times)

Offline GECO

Re: GECO AUDIO - vanguard power amp
« Reply #195 on: January 03, 2020, 01:17:48 PM »
Some additional functionality have been suggested to broaden the potential user base.

Please add below which additional features you would like to see. This will be mounted to the back panel

1 balanced inputs
2 12v trigger
3 dc blocker (not a fan but will make it so one van bypass it)
4 inrush limiting (delayed switch on)
5 over voltage protection

Offline JANNAS

Re: GECO AUDIO - vanguard power amp
« Reply #196 on: January 03, 2020, 04:36:32 PM »
Something completely different, good looking with the different colours, well done !! :2thumbs:

Offline JANNAS

Re: GECO AUDIO - vanguard power amp
« Reply #197 on: January 03, 2020, 04:50:09 PM »
Sorry, one last thing, I would have ensured the power supply caps and trannies have sufficient cooling, from the bottom and the top, but that is just me, oh and surely there a rubber grommets for the wiring through the metallic material. ;)

Offline gavinbirss

Re: GECO AUDIO - vanguard power amp
« Reply #198 on: January 03, 2020, 04:50:30 PM »
@GECO

Not sure what input sensitivity is but perhaps consider variable input level for the balanced inputs?

Like what Parasound does for THX level/2.8V?

Sure they problably null either of the unused phases and maybe use an opamp and negative gain?

Offline GECO

Re: GECO AUDIO - vanguard power amp
« Reply #199 on: January 03, 2020, 06:41:02 PM »
Sorry, one last thing, I would have ensured the power supply caps and trannies have sufficient cooling, from the bottom and the top, but that is just me, oh and surely there a rubber grommets for the wiring through the metallic material. ;)
Cooling definitely sufficient.
No material passing through metal except for  bolts

Offline GECO

Re: GECO AUDIO - vanguard power amp
« Reply #200 on: January 03, 2020, 06:45:53 PM »
@GECO

Not sure what input sensitivity is but perhaps consider variable input level for the balanced inputs?

Like what Parasound does for THX level/2.8V?

Sure they problably null either of the unused phases and maybe use an opamp and negative gain?
It won't be made to complicated will. will use a common industry standard and combine the phases with high quality opamps. I have found LM4562 to be the most neutral

Offline pwatts

Re: GECO AUDIO - vanguard power amp
« Reply #201 on: January 04, 2020, 01:36:08 PM »
It won't be made to complicated will. will use a common industry standard and combine the phases with high quality opamps. I have found LM4562 to be the most neutral

LM4562, my favourite general bipolar buffer/amplifier by a long shot, and far cheaper than the other boutique stuff out there. MC33078 not bad though if cost is really sensitive.
Anyhow, a selectable gain pad is not a bad idea: for those bored enough to have read my earlier rants about the low max gain of some AVP's, or the distortion penalty when approaching max gain, even just an internal jumper to add/reduce the gain by e.g. 12dB could go a long way for some applications.

Offline gavinbirss

Re: GECO AUDIO - vanguard power amp
« Reply #202 on: January 04, 2020, 03:33:30 PM »
@GECO

A extra request around balanced inputs, is bridged mono possible with XLR input?


Offline GECO

Re: GECO AUDIO - vanguard power amp
« Reply #203 on: January 04, 2020, 03:41:52 PM »
@GECO

A extra request around balanced inputs, is bridged mono possible with XLR input?
Maybe be in a next version. The speaker protect does not allow for it

Offline GECO

Re: GECO AUDIO - vanguard power amp
« Reply #204 on: January 14, 2020, 08:51:14 AM »
Some small changes to the interior layout. This also made some space for future additions

Offline Jozua_2019

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Re: GECO AUDIO - vanguard power amp
« Reply #205 on: January 14, 2020, 09:03:54 AM »
Very impressive !

I presume this mod required a new base plate?

Offline GECO

Re: GECO AUDIO - vanguard power amp
« Reply #206 on: January 14, 2020, 09:36:36 AM »
We turned it 180 and improved the mounting of the transformers.

Offline CAD

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Re: GECO AUDIO - vanguard power amp
« Reply #207 on: January 14, 2020, 10:34:46 AM »
Some small changes to the interior layout. This also made some space for future additions

That looks superb and tidy too.Well done  :thumbs:
Light travels faster than sound. This is why some people appear bright until you hear them speak.

Offline El Sid

Re: GECO AUDIO - vanguard power amp
« Reply #208 on: January 14, 2020, 12:43:23 PM »
Some small changes to the interior layout. This also made some space for future additions

The first song you play HAS to be Purple Haze. Or Purple Rain....

Offline Family_Dog

Re: GECO AUDIO - vanguard power amp
« Reply #209 on: January 14, 2020, 03:19:41 PM »
Or maybe "Purple People Eater"?


Nice job, Rudi!


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