| Author |
Message |
John Stewart
Guest
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 Posted:
Thu Sep 29, 2005 6:23 pm Post subject:
Re: Unsual PP Output Topology? |
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Phil Allison wrote:
| Quote: | "John Stewart"
Phil Allison wrote:
"John Stewart"
The connexion shown needs to have the common (gnd) connected to the 4R
tap
which is the mid-point on the 16R secondary. By coincidence, I tried
this
on
a simple PP 6V6 amp (pentode connected) with a Hammond 125E OPT on Sep
9/05.
Here are some results measured with & without this very limited form of
local voltage NFB.
On the 8R connexion the amp internal Z without NFB measured 42.98R,
rather
high as one might expect for a straight pentode amp with no FB.
** But a 6V6 is a " Beam Power Amplifier " ( GE Essential
Characteristics) - not a pentode.
......... Phil
So?
** What is your question ?
............ Phil
|
What is your answer?
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John Byrns
Guest
|
| Posted:
Thu Sep 29, 2005 8:35 pm Post subject:
Re: Unsual PP Output Topology? |
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In article <433BEABA.F441CFE1@sympatico.ca>, jh.stewart@sympatico.ca wrote:
| Quote: | Phil Allison wrote:
"John Stewart"
Phil Allison wrote:
"John Stewart"
The connexion shown needs to have the common (gnd) connected to the 4R
tap
which is the mid-point on the 16R secondary. By coincidence, I tried
this
on
a simple PP 6V6 amp (pentode connected) with a Hammond 125E OPT on Sep
9/05.
Here are some results measured with & without this very limited form of
local voltage NFB.
On the 8R connexion the amp internal Z without NFB measured 42.98R,
rather
high as one might expect for a straight pentode amp with no FB.
** But a 6V6 is a " Beam Power Amplifier " ( GE Essential
Characteristics) - not a pentode.
......... Phil
So?
** What is your question ?
............ Phil
What is your answer?
|
He has no answers, nor an original thought in his head.
Regards,
John Byrns
Surf my web pages at, http://users.rcn.com/jbyrns/ |
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Phil Allison
Guest
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| Posted:
Fri Sep 30, 2005 4:43 am Post subject:
Re: Unsual PP Output Topology? |
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"John Byrns" = psychotic, autistic pig
** He has no answers, nor ever an original thought in his head.
............ Phil |
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