New Heathkit AS101 owner - First post.

[cradeldorf]

You bought new 802's or are you talking about the ones AB offered to loan you?

[alancohen]

You bought new 802's or are you talking about the ones AB offered to loan you?

New ones. I figured after all this I would end up with them anyway.

[Earl K]

New ones. I figured after all this I would end up with them anyway.

Congrats on the purchase of 802Gs !

Oh crap, it is an 6.8K! It must have been misplaced on the display rack cuz it came right after the 5 ohm and before the 8s. I never looked. I still didn't see after reading both your posts. I still read the 6.8K as 6.8 ohms. Man, I suck. I guess I have a trip back to the electronics store tomorrow! Good catch guys.

Don't beat yourself up on that, afterall, 6.8R (fairly common shorthand ) looks very similar to 6.8K .

Just a note of caution ( since you are playing about with tube amps ), it is worth double/triple checking everything .

The bad news is my new 802-8Gs should be here tomorrow too. Do I install them too while the back is off or exercise patience and wait for the new mic to arrive?

I fail to see the downside ( to that equation ) , I would install them and get on with enjoying them .

I was keen ( somewhat ) to see what the 30923 network could do for your 806s / but that can wait for some other opportunity .

I think I'll take Earls suggestion and rebuild the XOs without the L-pads. After all, what are the chances that I'll need to mitigate the highs?

As long as you do include some form of midrange reduction ( then running without the existing variable Lpad, is worth trying out ).

- Note, your existing variable Lpad once freed up for other uses ( one side of it > usually the 0-30R portion ) can be wired into the 30923 circuit in place of the 6.5R resistor. Doing this ( along with a small "stop-limit" resistor of say 2-3R ) simulates the same ( variable ) midrange reduction circuit, as found in the N1201-8A .

And FWIW, the Samson Go Mic supposedly goes from 20Hz to 18K and REW is definitely set to start at zero Hz.

Once you have your new test mic ( & load it's EQ correction file into REW ), you'll be able to determine just how linear ( or not ) your Samson mic actually is ( through some direct comparisons of the test subject ) .

[alancohen]

Santa came early...



'cept FedEx brought only one

[alancohen]

FR with the 806s and 6.8R resistor instead if 6.8K!. I couldn't find 6.5Rs. I'll wait until the second 802 arrives before installing them.



For what it's worth, here's the low end. REW set to start at 10Hz. Mic rated at 20Hz. I still think I should be getting more SPL at the low end. Yes?

[cradeldorf]

I agree there's something wrong with that low end graph. Does it seem to have no low end, or is it just the measurement system is unable to hear it? Does the house feel like it's about to collapse? Like a real earthquake is happening right under the foundation? Because if it doesn't something is wrong.

[alancohen]

Last night was my son's birthday, so in all the excitement I forgot I had a package on my porch. I saw it this morning and my new mic is here!

I can't find the calibration file, but here's a quick experiment...much better! Sorry for the blurry pic.



And here's the FR:



This is the 806s with HF compensation circuit. L-pads installed and turned all the way up.