[R-390] UNSUBSCRIBE
Dave Sampson
challanger13041 at yahoo.com
Mon May 16 11:40:49 EDT 2016
From: "r-390-request at mailman.qth.net" <r-390-request at mailman.qth.net>
To: r-390 at mailman.qth.net
Sent: Saturday, May 14, 2016 6:11 PM
Subject: R-390 Digest, Vol 145, Issue 4
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Today's Topics:
1. Re: AGC Slow - Moment of silence (David Wise)
2. Re: AGC Slow - Moment of silence (Larry H)
3. Re: AGC Slow - Moment of silence (David Wise)
4. Re: AGC Slow - Moment of silence (David Wise)
5. Re: AGC Slow - Moment of silence (David Wise)
----------------------------------------------------------------------
Message: 1
Date: Fri, 13 May 2016 17:23:41 -0700
From: David Wise <David_Wise at Phoenix.com>
To: R-390 Forum <r-390 at mailman.qth.net>
Subject: Re: [R-390] AGC Slow - Moment of silence
Message-ID:
<FFF45F8A4E2B6F4CA4920B3B028CE73D162297D11C at SCL-ExchMB.phoenix.com>
Content-Type: text/plain; charset=UTF-8
Aw heck, typo, corrected below.
-----Original Message-----
From: David Wise
Sent: Friday, May 13, 2016 4:28 PM
To: R-390 Forum
Subject: RE: [R-390] AGC Slow - Moment of silence
I realized that AETMOS-51 can use C551 or an external 2uF cap.
THE MOD
Take 3
C590 on the grid side, C591 in series
If C551 is okay, omit steps 1 and 2.
1. Disconnect and tape off the wire (C551) at S107-7 (wiper)
2. Connect C590, 2uF, between S102-5 (MGC contact; V506A grid) and S107-7
3. Disconnect and tape off the wire (ground) at S107-9
4. Connect C591, 0.15uF, between S107-8 and S107-9
5. Connect R590, 10M, between S107-7 and S107-8
PRINCIPLES OF OPERATION
SLOW: Unchanged (V506A with 2uF of Miller feedback).
MED: V506A with 0.14uF of Miller feedback).
Instead of using C551 passively, we operate like SLOW, only with a smaller cap.
C591 (0.15uF) in series with C551 gives about 0.14uF of feedback capacitance,
which V506A multiplies to about 1.9uF of effective capacitance.
R590 (10M) keeps the high end of C551 near V506A's plate voltage, and keeps C591 discharged.
FAST: Unchanged. R590 (10M) keeps the high end of C551 near V506A's plate voltage.
Regards,
Dave Wise
------------------------------
Message: 2
Date: Sat, 14 May 2016 01:06:43 +0000 (UTC)
From: Larry H <dinlarh at att.net>
To: R-390 Forum <r-390 at mailman.qth.net>
Subject: Re: [R-390] AGC Slow - Moment of silence
Message-ID:
<175286474.1838308.1463188003545.JavaMail.yahoo at mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8
Hi Dave, ?This new one looks great. ?I sketched it out on a schematic and don't see a thing wrong with it (of course). ?This is much easier to do. ?This one does not require dropping the front panel, where as the last one would to get at S102-5. ?I like it.
Regards, Larry
From: David Wise <David_Wise at Phoenix.com>
To: R-390 Forum <r-390 at mailman.qth.net>
Sent: Friday, May 13, 2016 5:23 PM
Subject: Re: [R-390] AGC Slow - Moment of silence
Aw heck, typo, corrected below.
-----Original Message-----
From: David Wise
Sent: Friday, May 13, 2016 4:28 PM
To: R-390 Forum
Subject: RE: [R-390] AGC Slow - Moment of silence
I realized that AETMOS-51 can use C551 or an external 2uF cap.
THE MOD
Take 3
C590 on the grid side, C591 in series
If C551 is okay, omit steps 1 and 2.
1. Disconnect and tape off the wire (C551) at S107-7 (wiper)
2. Connect C590, 2uF, between S102-5 (MGC contact; V506A grid) and S107-7
3. Disconnect and tape off the wire (ground) at S107-9
4. Connect C591, 0.15uF, between S107-8 and S107-9
5. Connect R590, 10M, between S107-7 and S107-8
PRINCIPLES OF OPERATION
SLOW: Unchanged (V506A with 2uF of Miller feedback).
MED: V506A with 0.14uF of Miller feedback).
Instead of using C551 passively, we operate like SLOW, only with a smaller cap.
C591 (0.15uF) in series with C551 gives about 0.14uF of feedback capacitance,
which V506A multiplies to about 1.9uF of effective capacitance.
R590 (10M) keeps the high end of C551 near V506A's plate voltage, and keeps C591 discharged.
FAST: Unchanged.? R590 (10M) keeps the high end of C551 near V506A's plate voltage.
Regards,
Dave Wise
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------------------------------
Message: 3
Date: Sat, 14 May 2016 16:53:46 +0000
From: David Wise <David_Wise at Phoenix.com>
To: R-390 Forum <r-390 at mailman.qth.net>
Subject: Re: [R-390] AGC Slow - Moment of silence
Message-ID: <1463244826270.58362 at Phoenix.com>
Content-Type: text/plain; charset=WINDOWS-1252
DO NOT USE! IT'S NO GOOD. What a pity.
At MED speed, the resistor shunted across C591 adds a long "tail" to the response, just like the model for Dielectric Absorption.
Go back to my post of 20160510. That one's okay, there's no resistance inside the feedback loop.
Sorry!
Dave Wise
________________________________________
From: R-390 <r-390-bounces at mailman.qth.net> on behalf of Larry H <dinlarh at att.net>
Sent: Friday, May 13, 2016 6:06 PM
To: R-390 Forum
Subject: Re: [R-390] AGC Slow - Moment of silence
Hi Dave, This new one looks great. I sketched it out on a schematic and don't see a thing wrong with it (of course). This is much easier to do. This one does not require dropping the front panel, where as the last one would to get at S102-5. I like it.
Regards, Larry
From: David Wise <David_Wise at Phoenix.com>
To: R-390 Forum <r-390 at mailman.qth.net>
Sent: Friday, May 13, 2016 5:23 PM
Subject: Re: [R-390] AGC Slow - Moment of silence
Aw heck, typo, corrected below.
-----Original Message-----
From: David Wise
Sent: Friday, May 13, 2016 4:28 PM
To: R-390 Forum
Subject: RE: [R-390] AGC Slow - Moment of silence
I realized that AETMOS-51 can use C551 or an external 2uF cap.
THE MOD
Take 3
C590 on the grid side, C591 in series
If C551 is okay, omit steps 1 and 2.
1. Disconnect and tape off the wire (C551) at S107-7 (wiper)
2. Connect C590, 2uF, between S102-5 (MGC contact; V506A grid) and S107-7
3. Disconnect and tape off the wire (ground) at S107-9
4. Connect C591, 0.15uF, between S107-8 and S107-9
5. Connect R590, 10M, between S107-7 and S107-8
PRINCIPLES OF OPERATION
SLOW: Unchanged (V506A with 2uF of Miller feedback).
MED: V506A with 0.14uF of Miller feedback).
Instead of using C551 passively, we operate like SLOW, only with a smaller cap.
C591 (0.15uF) in series with C551 gives about 0.14uF of feedback capacitance,
which V506A multiplies to about 1.9uF of effective capacitance.
R590 (10M) keeps the high end of C551 near V506A's plate voltage, and keeps C591 discharged.
FAST: Unchanged. R590 (10M) keeps the high end of C551 near V506A's plate voltage.
Regards,
Dave Wise
______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390 at mailman.qth.net
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390 at mailman.qth.net
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Please help support this email list: http://www.qsl.net/donate.html
------------------------------
Message: 4
Date: Sat, 14 May 2016 17:09:36 +0000
From: David Wise <David_Wise at Phoenix.com>
To: R-390 Forum <r-390 at mailman.qth.net>
Subject: Re: [R-390] AGC Slow - Moment of silence
Message-ID: <1463245775353.2084 at Phoenix.com>
Content-Type: text/plain; charset=WINDOWS-1252
Actually, use my edited post of 20160511. This new Outlook Web App is infuriating.
Dave Wise
________________________________________
From: R-390 <r-390-bounces at mailman.qth.net> on behalf of David Wise <David_Wise at Phoenix.com>
Sent: Saturday, May 14, 2016 9:53 AM
To: R-390 Forum
Subject: Re: [R-390] AGC Slow - Moment of silence
DO NOT USE! IT'S NO GOOD. What a pity.
At MED speed, the resistor shunted across C591 adds a long "tail" to the response, just like the model for Dielectric Absorption.
Go back to my post of 20160510. That one's okay, there's no resistance inside the feedback loop.
Sorry!
Dave Wise
________________________________________
From: R-390 <r-390-bounces at mailman.qth.net> on behalf of Larry H <dinlarh at att.net>
Sent: Friday, May 13, 2016 6:06 PM
To: R-390 Forum
Subject: Re: [R-390] AGC Slow - Moment of silence
Hi Dave, This new one looks great. I sketched it out on a schematic and don't see a thing wrong with it (of course). This is much easier to do. This one does not require dropping the front panel, where as the last one would to get at S102-5. I like it.
Regards, Larry
From: David Wise <David_Wise at Phoenix.com>
To: R-390 Forum <r-390 at mailman.qth.net>
Sent: Friday, May 13, 2016 5:23 PM
Subject: Re: [R-390] AGC Slow - Moment of silence
Aw heck, typo, corrected below.
-----Original Message-----
From: David Wise
Sent: Friday, May 13, 2016 4:28 PM
To: R-390 Forum
Subject: RE: [R-390] AGC Slow - Moment of silence
I realized that AETMOS-51 can use C551 or an external 2uF cap.
THE MOD
Take 3
C590 on the grid side, C591 in series
If C551 is okay, omit steps 1 and 2.
1. Disconnect and tape off the wire (C551) at S107-7 (wiper)
2. Connect C590, 2uF, between S102-5 (MGC contact; V506A grid) and S107-7
3. Disconnect and tape off the wire (ground) at S107-9
4. Connect C591, 0.15uF, between S107-8 and S107-9
5. Connect R590, 10M, between S107-7 and S107-8
PRINCIPLES OF OPERATION
SLOW: Unchanged (V506A with 2uF of Miller feedback).
MED: V506A with 0.14uF of Miller feedback).
Instead of using C551 passively, we operate like SLOW, only with a smaller cap.
C591 (0.15uF) in series with C551 gives about 0.14uF of feedback capacitance,
which V506A multiplies to about 1.9uF of effective capacitance.
R590 (10M) keeps the high end of C551 near V506A's plate voltage, and keeps C591 discharged.
FAST: Unchanged. R590 (10M) keeps the high end of C551 near V506A's plate voltage.
Regards,
Dave Wise
______________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390 at mailman.qth.net
This list hosted by: http://www.qsl.net/
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390 at mailman.qth.net
This list hosted by: http://www.qsl.net/
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390 at mailman.qth.net
This list hosted by: http://www.qsl.net/
Please help support this email list: http://www.qsl.net/donate.html
------------------------------
Message: 5
Date: Fri, 13 May 2016 16:28:28 -0700
From: David Wise <David_Wise at Phoenix.com>
To: R-390 Forum <r-390 at mailman.qth.net>
Subject: Re: [R-390] AGC Slow - Moment of silence
Message-ID:
<FFF45F8A4E2B6F4CA4920B3B028CE73D162297D113 at SCL-ExchMB.phoenix.com>
Content-Type: text/plain; charset=UTF-8
I realized that AETMOS-51 can use C551 or an external 2uF cap.
THE MOD
Take 3
C590 on the grid side, C591 in series
If C551 is okay, omit steps 1 and 2.
1. Disconnect and tape off the wire (C551) at S107-7 (wiper)
2. Connect C590, 2uF, between S102-5 (MGC contact; V506A grid) and S107-7
3. Disconnect and tape off the wire (ground) at S107-9
4. Connect C591, 0.15uF, between S107-8 and S107-9
5. Connect R590, 10M, between S107-7 and S107-8
PRINCIPLES OF OPERATION
SLOW: Unchanged (V506A with 2uF of Miller feedback).
MED: V506A with 0.14uF of Miller feedback).
Instead of using C551 passively, we operate like SLOW, only with a smaller cap.
C590 (0.15uF) in series with C551 gives about 0.14uF of feedback capacitance,
which V506A multiplies to about 1.9uF of effective capacitance.
R590 (10M) keeps the high end of C551 near V506A's plate voltage, and keeps C591 discharged.
FAST: Unchanged. R590 (10M) keeps the high end of C551 near V506A's plate voltage.
Regards,
Dave Wise
------------------------------
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