ACA V1.5 Illustrated Build Guide

[6L6]

Bridge will give you twice the voltage swing which is roughly 4x the power, so about 20w.

I haven’t yet made the bridge configuration, but it’s in the queue of things to do, and measurements will follow.

 

[Zen Mod]

don't use force

use bigger hammer

(build bigger amp,plenty of these in Papaland)

 

[SRMcGee]

Zen Mod:

You're correct, of course. I just thought it might be fun to try something a little different. The idea I'm playing with is to also add a B1 to make this project into a small integrated amp.

Regards,
Scott

 

[Zen Mod]

of course , if that amuses you .....

there is somewhere in start of the thread , buried iteration with plenty volts in PSU

 

[chrisb]

Zen Mod:

You're correct, of course. I just thought it might be fun to try something a little different. The idea I'm playing with is to also add a B1 to make this project into a small integrated amp.

Regards,
Scott

something like a DIY INT60 ?

 

[SRMcGee]

chrisb:

Yup, sorta. One of my daughters is living in NYC and could use a stereo, and I'm looking for an excuse to build something. She's in no rush (which is good) and whatever I build should be relatively low-powered. This might be a summer project. I thought a souped-up ACA would be fun.

ZM:

Yeah, I'll start going back over the thread. My plan is to build something with an internal power supply (probably with a 24V rail) instead of using a brick, and it's been a while since I read the entire thread for ideas/insights.

Jim:

Uhm, a dumb question: would a bridged version of the ACA require different MOSFETs? In other words, wouldn't the polarity of the circuit have to be reversed on one of the pcbs?

Regards,
Scott

 

[Zen Mod]

two identical pcbs - you feed them (through XLR) with two antiphase signals , taking output from hots

read F4 User Manual for specific details , same principle

 

[chrisb]

Scott - I'm thinking several concurrent conversations / queries on that subject just might pique the interest of "management" to the possible market demand for such a little gadget.

 

[6L6]

Of course there's an interest in a circuit like that... Find me somebody to design it and we'll talk!

 

[planet10]

Bridge will give you twice the voltage swing which is roughly 4x the power, so about 20w.

I have 2 of these underway to use as mono-bloke. As well i will be bi-amping with a 150w Sears/Hitachi dual mono MosFet amp to drive rthe woofers below 180Hz. Should be plenty of power for my needs.

dave

 

[6L6]

I have 2 of these underway to use as mono-bloke.

Mono-bloke.

One-friend.

Get it?

 

[clowkoy]

Is there a reason you're not using the lock washers provided in the kit?

 

[6L6]

Forgot to install them since the pre-production kit I had didn't have any. I'll re-photograph when I get a chance.

Use them.

 

[chrisb]

Of course there's an interest in a circuit like that... Fine me somebody to design it and we'll talk!

Rumour has it you know a guy who knows a guy, but he can be picky about his projects

Some guys, really.

 

[clowkoy]

Forgot to install them since the pre-production kit I had didn't have any. I'll re-photograph when I get a chance.

Use them.

Thanks Jim! Great work!

 

[FengLiu]

The single-ended output impedance is so large. Why do so many people like it?

 

[Zen Mod]

Sissies

 

[6L6]

The single-ended output impedance is so large. Why do so many people like it?

Low output impedance does not automatically mean good amplifier sound. There are many other parameters that make an amplifier sound wonderful.

 

[ColinA123]

The single-ended output impedance is so large. Why do so many people like it?

Is this a case of judging an amplifier by reading paper specs
rather that actually listening to it?

 

[MEPER]

Is there any recommendation regarding signal ground / chassis ground?
I could not se any place where the chassis ground is connected....via a capacitor, resistor.......direct connection?