Fairchild interest.

[fdlsys]

More Candy!. I guess i have to start working now.

Ouch. Poor planning. You'll need a bigger truck.

 

[buzzforb]

Shouldnt be mixing work and play

 

[albertNL]

Added 2 sets to the spreadsheet. That should be OK for 1 stereo F5 with double FETs, using this store board, right?
P-F5c-2V20 - Pair of F-5c boards (Makes 2 channels; Rev 2.0)

Thanks,

Albert

 

[buzzforb]

THats correct.

 

[DaveG]

just moved my sets around in different matching columns. Same total number of mosfets (48) as before. But now the ability to build a BA2 output.
Dave

 

[delecoy]

Signed up for 4 quads. Many thanks!

 

[Nelson Bass]

I vote for triplets! I need 4x'3 matched N and P (6)'

but as this is not an option I'm in for 2x'FQA sextuplet of matched N and P (12)'

I removed my interest in these FETs from the spreadsheet.

Back to what matters most.

 

[fdlsys]

...Back to what matters most.

I'm afraid to ask No, don't tell me...

 

[a.wayne]

Any updates on this Buzz ....

 

[buzzforb]

Matching of the P parts has begun and going well. THe N channel parts have become a bit of a pain. I have cycled through multiple sample of the 19n20C part tha have been fake. I have some more coming that will be tested soon. If they turn out to be bogus, I think we should look at the possiblity of using the standard 19n20 (non-c) part. The numbers differ slightly, but should not present any significant difference in performance. The availiblity of P3 to trim out differences in the output stage helps us in this regard. I will provide repsonse curves for all the fets involved and if "C" designated parts cannot be sourced, then I will show comparison of "non-C" vs "C" parts. My intent was to release this info after i had gone through all alternatives, but your question presented the opportunity. My suggestion is to sit tight and I will have info very soon hopefully.

 

[labjr]

Matching of the P parts has begun and going well. THe N channel parts have become a bit of a pain. I have cycled through multiple sample of the 19n20C part tha have been fake. I have some more coming that will be tested soon. If they turn out to be bogus, I think we should look at the possiblity of using the standard 19n20 (non-c) part. The numbers differ slightly, but should not present any significant difference in performance. The availiblity of P3 to trim out differences in the output stage helps us in this regard. I will provide repsonse curves for all the fets involved and if "C" designated parts cannot be sourced, then I will show comparison of "non-C" vs "C" parts. My intent was to release this info after i had gone through all alternatives, but your question presented the opportunity. My suggestion is to sit tight and I will have info very soon hopefully.

Curious where the 19N20c parts came from?

 

[buzzforb]

Based on what I am seeing, only boxed parts can be trusted and this is only after Fairchild approval. I have people trying to sell 10+ datecode stuff

 

[6L6]

Is Fairchild interested in the fakes?

 

[buzzforb]

No. On possible large orders, they will confirm authenticity of parts. Getting the N channel parts is proving difficult. The fake market is massive in Asia.

 

[labjr]

Did you get the parts from an authorized Fairchild distributor?

I bought some from Online Components last year which I haven't tried. I hope they aren't fakes.

 

[buzzforb]

I know some folks who have gotten legit pieces from them. Based on what I have been through, i wouldn't trust anything. Mine have measured well, but always tended to show oscillation problems.

 

[labjr]

What a major PITA the asians have become with their counterfeit junk.

 

[a.wayne]

Matching of the P parts has begun and going well. THe N channel parts have become a bit of a pain. I have cycled through multiple sample of the 19n20C part tha have been fake. I have some more coming that will be tested soon. If they turn out to be bogus, I think we should look at the possiblity of using the standard 19n20 (non-c) part. The numbers differ slightly, but should not present any significant difference in performance. The availiblity of P3 to trim out differences in the output stage helps us in this regard. I will provide repsonse curves for all the fets involved and if "C" designated parts cannot be sourced, then I will show comparison of "non-C" vs "C" parts. My intent was to release this info after i had gone through all alternatives, but your question presented the opportunity. My suggestion is to sit tight and I will have info very soon hopefully.

Thanks ....

 

[scranton]

I attempted to add my name to the sign up sheet and I may have deleted the next to last name entered in the spreadsheet. I highlighted the last blank line, but my entry posted 2 lines up. I hope you have a saved spreadsheet with all the names. I apologize.

 

[buzzforb]

Nope, but i am sure folks will keep an eye out.