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A Very Compact Hybrid Amp - Page 48

post #706 of 2213
Quote:
Originally Posted by wiatrob View Post
I hate to be the one to disparage the idea of hooking two of these amps up balanced (as I floated the idea early on). But there are some technical hurdles due to the virtual ground levels. I think they're mentioned earlier in the thread...
I hadn't thought about that, good point. Well, I know I have lot's of other things that should be occupying my time, rather than thinking about such things.

Loving the sound of CBC Radio 2 right now via my K601's and CTH with an Amperex 6DJ8...
post #707 of 2213
From AMB's Beta22 "other options" page.

post #708 of 2213
Whew.. I reiterate my previous comment...

OOhhh.. "The Firebird" just gave me the shivers...
post #709 of 2213
Thread Starter 
Quote:
Originally Posted by holland View Post
From AMB's Beta22 "other options" page.

Unfortunately, this is not quite the same situation. In AMB's case there is just ONE ground channel for both outputs. In the CTH there are, effectively, TWO ground channels and they are built in to the amp. How well the channels match depends on two things:

1. What the exact LV is. There is variation in regs and they will not be the same. This matters because the LV determines the OG (ground channel) voltage.

2. The actual splitter behavior (mostly determined by the TLE). These devices have tolerances too and they don't exactly split the rail in half.

So, the OL and OR or each amp will match the OG. Two amps tied together will have a DC offset across the headphones determined by how far apart the two OG's are.

This is not to say that it can't be done, only that some matching may be required.

If you guys really want a balanced version the designer should design one.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #710 of 2213
Quote:
Originally Posted by runeight View Post
Unfortunately, this is not quite the same situation. In AMB's case there is just ONE ground channel for both outputs. In the CTH there are, effectively, TWO ground channels and they are built in to the amp. How well the channels match depends on two things:

1. What the exact LV is. There is variation in regs and they will not be the same. This matters because the LV determines the OG (ground channel) voltage.

2. The actual splitter behavior (mostly determined by the TLE). These devices have tolerances too and they don't exactly split the rail in half.

So, the OL and OR or each amp will match the OG. Two amps tied together will have a DC offset across the headphones determined by how far apart the two OG's are.

This is not to say that it can't be done, only that some matching may be required.

If you guys really want a balanced version the designer should design one.
LOL, you can design one if you like. I'm not a balanced user.

Actually, in AMB's case, there are 2 ground channels, as that's wiring for a 6-channel Beta22.

The + and - are taken from the same side (1 ground for that side). The DC on that one side should be offset within itself by the + and -. G is not attached, so the DC floats.

I guess a more apropro situation is this (and less confusing though they are the same), with the M3.

post #711 of 2213
Mine arrived in the mail today. I'll be checking them out tomorrow...

Thanks again, Sachu.

Quote:
Originally Posted by sachu View Post
A big thanks for all those who participated in the 6N1P tube group buy..

Those in the states should be receiving your tubes in a day or two at most and in a week for our friends abroad.

Payment has been received from everyone. Thank you very much all. Hope the tubes light up your eyes and warm your ears.

Cheers,
Sachu
post #712 of 2213
Quote:
Originally Posted by runeight View Post
If you guys really want a balanced version the designer should design one.
The designer should totally do that
post #713 of 2213
Yes, and use moar tubes because they're pretty

I'm so shallow! hehe
post #714 of 2213
Quote:
Originally Posted by smeggy View Post
Yes, and use moar tubes because they're pretty

I'm so shallow! hehe
heh..man you just built a SS and now you are spoiled Gary
post #715 of 2213
must..have...tooooobz!!

and send your addy!!
post #716 of 2213
The compatible tube list for this little jewel just keeps growing... I think it will encourage tube rolling madness. Sounds like smeggy is already infected
post #717 of 2213
I was looking over the board and sackfull of components in wonderment.... that's a lot of stuff!
post #718 of 2213
Quote:
Originally Posted by smeggy View Post
I was looking over the ... sackfull of components in wonderment.... that's a lot of stuff!
That's what she said, Smeggy old boy.
post #719 of 2213
hehe

I'd need a microscope to read the component labels on this thing. Luckily I'm able to have it put together by younger eyes than mine.
post #720 of 2213
Here ya go.

10X-20X STEREO BINOCULAR MICROSCOPE BOOM ARM + LIGHT - eBay (item 170268345984 end time Apr-29-09 16:25:03 PDT)

Got to love the text:

Quote:
INCOMPARABLY SUPERIOR TO OTHER OFFERS ON eBay!
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