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Old 14th August 2013, 04:39 PM   #1241
toobhed is offline toobhed  United States
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No, I never heard any hum at all on 89db speakers, either before the heat sinks were mounted to the chassis or after.
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Old 14th August 2013, 08:07 PM   #1242
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I have a classic Exposure XVll preamp that has an unusually high gain structure than the average preamp which makes it a difficult match for most amps. Do you think I will have any issues with matching it with the ACA that I would like to build?

I tried using the Exposure with a Luxman L-58a as the power amplifier (it has main in's) and I gotta a loud hiss and weird noise on first start up.
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Old 14th August 2013, 11:46 PM   #1243
Variac is offline Variac  United States
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An F-4 seems like a natural...it requires a high gain preamp as it has no voltage gain stage
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Old 15th August 2013, 12:19 AM   #1244
6L6 is offline 6L6  United States
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Enochrome - yes, a quick look at the specs of your preamp shows it to be a monster! The F4 would be a perfect amp. As Variac says, it (the F4) has no gain of it's own, and your preamp look like it should be able to drive it very well!

The F4, BTW, is an utterly fantastic sounding amplifier.
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Old 17th August 2013, 12:53 PM   #1245
Bones13 is offline Bones13  United States
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I received an email that the ACA kits are in the warehouse, and will be shipped soon!
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Old 17th August 2013, 01:48 PM   #1246
12B4A is offline 12B4A  United States
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Christmas in August starts now...
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Old 17th August 2013, 04:02 PM   #1247
toobhed is offline toobhed  United States
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...received the ACA red/black chassis yesterday in the mail thanks to all at the DIY store!
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Old 17th August 2013, 07:10 PM   #1248
WalterW is offline WalterW  Netherlands
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Quote:
Originally Posted by Bones13 View Post
I received an email that the ACA kits are in the warehouse, and will be shipped soon!
+1
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Old 18th August 2013, 01:51 PM   #1249
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Hi
Heres some rules I learned as an apprentice.
Mustly from Martin-Marietta`s "HANDBOOK OF WORKMANSHIP" (rocket science !)
All signal or DC carrying wires should be twisted hard/tight.(use a drill and a vice to twist)
+V,-V,0 V should be braided in hand,again tight.
All to minimize noise coming out from or into the wires.
And yes,it looks nice to.
Connect all 0V to the same point.(star)
If you are using screened cable for input and having hum,try disconecting the screen at one end.

Jan
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Old 18th August 2013, 04:17 PM   #1250
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Quote:
Originally Posted by 6L6 View Post
Enochrome - yes, a quick look at the specs of your preamp shows it to be a monster! The F4 would be a perfect amp. As Variac says, it (the F4) has no gain of it's own, and your preamp look like it should be able to drive it very well!

The F4, BTW, is an utterly fantastic sounding amplifier.
Thanks Variac and 6L6!!!!!

This was getting a bit worrisome because I really love the sound of the preamp and it is very hard to find in the States. I could not seem to find a compatible amp that I could afford and you guys pointing me to the F4 was the answer I was looking for.

I can't wait to start but this will be my first amp build so I will take it slow and work from 6L6's great build thread. I am getting together the parts and cost list.

Is there a BOM list that I can upload to Digikey or Mouser? Also, is there a place to find enclosure parts and a toroidal transformer of appropriate value?
I work at a design school so I have access to a machine and wood shop.
Lastly, what is the appropriate size of heatsink that I should get for each channel?

Sorry about all the questions

A big thanks for suggesting this amp it seems to be exactly what I was looking for.

Cheers,
Enochrome
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