[Boatanchors] Boatanchors Digest, Vol 86, Issue 49

Thu Mar 24 02:19:56 EDT 2011

My 1942, "The ARRL radío amateurs handbook," does list the 1625 (pg. 417, 
just below mid page),
but listed directly beneath and together with the 807.
The tube diagram(T5BB) does not use the beam forming plate symbol.

Henry
OZ3O N2NR

----- Original Message ----- 
From: <boatanchors-request at mailman.qth.net>
To: <boatanchors at mailman.qth.net>
Sent: Wednesday, March 23, 2011 9:15 PM
Subject: Boatanchors Digest, Vol 86, Issue 49

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> Today's Topics:
>
>   1. 1625 tube(s) (rbethman)
>   2. Re: 1625 tube(s) (Richard Knoppow)
>   3. Re: 1625 tube(s) (Pete Lancashire)
>   4. Re: 1625 tube(s) (Glen Zook)
>   5. Re: 1625 tube(s) (mac)
>   6. Re: 1625 tube(s) (Bob Macklin)
>   7. Re: 1625 tube(s) (J. Forster)
>   8. Re: 1625 tube(s) (rbethman)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 23 Mar 2011 12:34:27 -0400
> From: rbethman <rbethman at comcast.net>
> Subject: [Boatanchors] 1625 tube(s)
> To: Boatanchors Mail List <boatanchors at mailman.qth.net>
> Message-ID: <4D8A2113.9060504 at comcast.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I've had to go back as far as a copy of the 1941 Radio Handbook
> published by the ARRL to find a "proper" tube diagram that clearly shows
> the "beam forming plates".  However, this stopped at listing of the
> 1621, (not its diagram.), and it did not list the 1625.
>
> This simply leaves myself and others in the *elifIknow* mode!
>
> Then again, I have no intent of using 1625s in GG.  I don't have a thing
> here that even uses them.  I *DO* have equipment that uses 807s.  That
> would be the BC-610 and the T-213.
>
> So we have beat it to death, and find the tube manuals "LACKING"!
>
> Bob - N0DGN
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 23 Mar 2011 11:36:12 -0700
> From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
> Subject: Re: [Boatanchors] 1625 tube(s)
> To: "Boatanchors Mail List" <boatanchors at mailman.qth.net>
> Message-ID: <BE3D61CDD5504AA083394804FFE6F7B1 at VALUED20606295>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
>
> ----- Original Message ----- 
> From: "rbethman" <rbethman at comcast.net>
> To: "Boatanchors Mail List" <boatanchors at mailman.qth.net>
> Sent: Wednesday, March 23, 2011 9:34 AM
> Subject: [Boatanchors] 1625 tube(s)
>
>
>> I've had to go back as far as a copy of the 1941 Radio
>> Handbook
>> published by the ARRL to find a "proper" tube diagram that
>> clearly shows
>> the "beam forming plates".  However, this stopped at
>> listing of the
>> 1621, (not its diagram.), and it did not list the 1625.
>>
>> This simply leaves myself and others in the *elifIknow*
>> mode!
>>
>> Then again, I have no intent of using 1625s in GG.  I
>> don't have a thing
>> here that even uses them.  I *DO* have equipment that uses
>> 807s.  That
>> would be the BC-610 and the T-213.
>>
>> So we have beat it to death, and find the tube manuals
>> "LACKING"!
>>
>> Bob - N0DGN
>
>     FWIW, the RCA receiving tube handbooks all have a
> section describing beam power tubes with a drawing and
> explanation. I am not sure when the standard tube diagrams
> stopped indicating the plates and replaced them with the
> pentode symbol. I thin it was a simplfication of required
> symbols.
>     The beam forming plates act in some ways like a virtual
> suppressor grid since the field they produce eliminates
> secondary emission and the negative resistance
> characteristic found in tetrodes. I am not certain what sort
> of characteristics the plates have as far as being able to
> modulate the electron beam. It may be they have enough
> effect to function as a modulation grid or perhaps not. Beam
> pentodes seem to have originated around 1935. They have
> better efficiency than power tubes employing a third grid
> such as the 6F6. The 1625 and 807 are very similar in
> construction to the 6L6 but have plate caps which lowers the
> interelectrod capacitance and extends the maximum frequency
> considerably.
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com
>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 23 Mar 2011 12:31:52 -0700
> From: Pete Lancashire <pete at petelancashire.com>
> Subject: Re: [Boatanchors] 1625 tube(s)
> To: Richard Knoppow <1oldlens1 at ix.netcom.com>
> Cc: Boatanchors Mail List <boatanchors at mailman.qth.net>
> Message-ID:
> <AANLkTi=YWB9+9=U0EZSbLJPt8JQPM1fcviFOe+8-fxTc at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> a side question. If one was building a 40 M xmitter from scratch for
> fun would one want to use a 807 or a 1625 ?
>
> any reason one over the other .. I can't think of any.
>
> -pete
>
> On Wed, Mar 23, 2011 at 11:36 AM, Richard Knoppow
> <1oldlens1 at ix.netcom.com> wrote:
>>
>> ----- Original Message -----
>> From: "rbethman" <rbethman at comcast.net>
>> To: "Boatanchors Mail List" <boatanchors at mailman.qth.net>
>> Sent: Wednesday, March 23, 2011 9:34 AM
>> Subject: [Boatanchors] 1625 tube(s)
>>
>>
>>> I've had to go back as far as a copy of the 1941 Radio
>>> Handbook
>>> published by the ARRL to find a "proper" tube diagram that
>>> clearly shows
>>> the "beam forming plates". ?However, this stopped at
>>> listing of the
>>> 1621, (not its diagram.), and it did not list the 1625.
>>>
>>> This simply leaves myself and others in the *elifIknow*
>>> mode!
>>>
>>> Then again, I have no intent of using 1625s in GG. ?I
>>> don't have a thing
>>> here that even uses them. ?I *DO* have equipment that uses
>>> 807s. ?That
>>> would be the BC-610 and the T-213.
>>>
>>> So we have beat it to death, and find the tube manuals
>>> "LACKING"!
>>>
>>> Bob - N0DGN
>>
>> ? ? FWIW, the RCA receiving tube handbooks all have a
>> section describing beam power tubes with a drawing and
>> explanation. I am not sure when the standard tube diagrams
>> stopped indicating the plates and replaced them with the
>> pentode symbol. I thin it was a simplfication of required
>> symbols.
>> ? ? The beam forming plates act in some ways like a virtual
>> suppressor grid since the field they produce eliminates
>> secondary emission and the negative resistance
>> characteristic found in tetrodes. I am not certain what sort
>> of characteristics the plates have as far as being able to
>> modulate the electron beam. It may be they have enough
>> effect to function as a modulation grid or perhaps not. Beam
>> pentodes seem to have originated around 1935. They have
>> better efficiency than power tubes employing a third grid
>> such as the 6F6. The 1625 and 807 are very similar in
>> construction to the 6L6 but have plate caps which lowers the
>> interelectrod capacitance and extends the maximum frequency
>> considerably.
>>
>>
>> --
>> Richard Knoppow
>> Los Angeles
>> WB6KBL
>> dickburk at ix.netcom.com
>>
>> ______________________________________________________________
>> Boatanchors mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Boatanchors at mailman.qth.net
>>
>> List Administrator: Duane Fischer, W8DBF
>> ** For Assistance: dfischer at usol.com **
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 23 Mar 2011 12:35:52 -0700 (PDT)
> From: Glen Zook <gzook at yahoo.com>
> Subject: Re: [Boatanchors] 1625 tube(s)
> To: Richard Knoppow <1oldlens1 at ix.netcom.com>, Pete Lancashire
> <pete at petelancashire.com>
> Cc: Boatanchors Mail List <boatanchors at mailman.qth.net>
> Message-ID: <27333.5116.qm at web121705.mail.ne1.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
> Depends on whether or not you have a 6.3 VAC filament winding or a 12.6 
> filament winding on the transformer!  Also, whether or not you have a 
> 5-pin socket or a 7-pin socket!  :>)
>
> Glen, K9STH
>
> Website:  http://k9sth.com
>
>
> --- On Wed, 3/23/11, Pete Lancashire <pete at petelancashire.com> wrote:
>
> a side question. If one was building a 40 M xmitter from scratch for fun 
> would one want to use a 807 or a 1625 ?
>
> any reason one over the other .. I can't think of any.
>
>
>
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 23 Mar 2011 12:53:07 -0700
> From: mac <w7qho at aol.com>
> Subject: Re: [Boatanchors] 1625 tube(s)
> To: Pete Lancashire <pete at petelancashire.com>
> Cc: Boatanchors Mail List <boatanchors at mailman.qth.net>
> Message-ID: <42E87E80-A174-4462-AF68-81ECE0E29BF0 at aol.com>
> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>
> When confronted with just such a question recently the availability of
> tube sockets was the deciding factor at radio W7QHO.  Didn't have a
> suitable 7-pin socket on hand but plenty of ceramic 5 pins so an 807
> got the job.  :^)
>
> Dennis D. W7QHO
> Glendale, CA
>
> *************
>
> On Mar 23, 2011, at 12:31 PM, Pete Lancashire wrote:
>
>> a side question. If one was building a 40 M xmitter from scratch for
>> fun would one want to use a 807 or a 1625 ?
>>
>> any reason one over the other .. I can't think of any.
>
>
>
> ------------------------------
>
> Message: 6
> Date: Wed, 23 Mar 2011 12:58:42 -0700
> From: Bob Macklin <macklinbob at msn.com>
> Subject: Re: [Boatanchors] 1625 tube(s)
> To: "Pete Lancashire" <pete at petelancashire.com>, "Richard Knoppow"
> <1oldlens1 at ix.netcom.com>
> Cc: Boatanchors Mail List <boatanchors at mailman.qth.net>
> Message-ID: <BLU0-SMTP145DE76D66AE849F767B7D5C5B70 at phx.gbl>
> Content-Type: text/plain; format=flowed; charset="UTF-8";
> reply-type=original
>
> 807s have 6V filaments. 1625s have 12V filaments,
>
> Good 807 sockets are easy to find. I don't know about 1625 sockets.
>
> Bob Macklin
> K5MYJ
> Seattle, Wa.
> "Real Radios Glow In The Dark"
> ----- Original Message ----- 
> From: "Pete Lancashire" <pete at petelancashire.com>
> To: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
> Cc: "Boatanchors Mail List" <boatanchors at mailman.qth.net>
> Sent: Wednesday, March 23, 2011 12:31 PM
> Subject: Re: [Boatanchors] 1625 tube(s)
>
>
>>a side question. If one was building a 40 M xmitter from scratch for
>> fun would one want to use a 807 or a 1625 ?
>>
>> any reason one over the other .. I can't think of any.
>>
>> -pete
>>
>> On Wed, Mar 23, 2011 at 11:36 AM, Richard Knoppow
>> <1oldlens1 at ix.netcom.com> wrote:
>>>
>>> ----- Original Message -----
>>> From: "rbethman" <rbethman at comcast.net>
>>> To: "Boatanchors Mail List" <boatanchors at mailman.qth.net>
>>> Sent: Wednesday, March 23, 2011 9:34 AM
>>> Subject: [Boatanchors] 1625 tube(s)
>>>
>>>
>>>> I've had to go back as far as a copy of the 1941 Radio
>>>> Handbook
>>>> published by the ARRL to find a "proper" tube diagram that
>>>> clearly shows
>>>> the "beam forming plates". However, this stopped at
>>>> listing of the
>>>> 1621, (not its diagram.), and it did not list the 1625.
>>>>
>>>> This simply leaves myself and others in the *elifIknow*
>>>> mode!
>>>>
>>>> Then again, I have no intent of using 1625s in GG. I
>>>> don't have a thing
>>>> here that even uses them. I *DO* have equipment that uses
>>>> 807s. That
>>>> would be the BC-610 and the T-213.
>>>>
>>>> So we have beat it to death, and find the tube manuals
>>>> "LACKING"!
>>>>
>>>> Bob - N0DGN
>>>
>>> FWIW, the RCA receiving tube handbooks all have a
>>> section describing beam power tubes with a drawing and
>>> explanation. I am not sure when the standard tube diagrams
>>> stopped indicating the plates and replaced them with the
>>> pentode symbol. I thin it was a simplfication of required
>>> symbols.
>>> The beam forming plates act in some ways like a virtual
>>> suppressor grid since the field they produce eliminates
>>> secondary emission and the negative resistance
>>> characteristic found in tetrodes. I am not certain what sort
>>> of characteristics the plates have as far as being able to
>>> modulate the electron beam. It may be they have enough
>>> effect to function as a modulation grid or perhaps not. Beam
>>> pentodes seem to have originated around 1935. They have
>>> better efficiency than power tubes employing a third grid
>>> such as the 6F6. The 1625 and 807 are very similar in
>>> construction to the 6L6 but have plate caps which lowers the
>>> interelectrod capacitance and extends the maximum frequency
>>> considerably.
>>>
>>>
>>> --
>>> Richard Knoppow
>>> Los Angeles
>>> WB6KBL
>>> dickburk at ix.netcom.com
>>>
>>> ______________________________________________________________
>>> Boatanchors mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Boatanchors at mailman.qth.net
>>>
>>> List Administrator: Duane Fischer, W8DBF
>>> ** For Assistance: dfischer at usol.com **
>>>
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>>
>> ______________________________________________________________
>> Boatanchors mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Boatanchors at mailman.qth.net
>>
>> List Administrator: Duane Fischer, W8DBF
>> ** For Assistance: dfischer at usol.com **
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 7
> Date: Wed, 23 Mar 2011 13:06:15 -0700 (PDT)
> From: "J. Forster" <jfor at quik.com>
> Subject: Re: [Boatanchors] 1625 tube(s)
> To: "Bob Macklin" <macklinbob at msn.com>
> Cc: Boatanchors Mail List <boatanchors at mailman.qth.net>, Pete
> Lancashire <pete at petelancashire.com>
> Message-ID: <60404.12.6.201.2.1300910775.squirrel at popaccts.quikus.com>
> Content-Type: text/plain;charset=iso-8859-1
>
> I think they are still making 807s, so use those. The supply of 1625s for
> use in ARC-5s, etc. is limited and diminishing.
>
> YMMV,
>
> -John
>
> ===============
>
>
>> 807s have 6V filaments. 1625s have 12V filaments,
>>
>> Good 807 sockets are easy to find. I don't know about 1625 sockets.
>>
>> Bob Macklin
>> K5MYJ
>> Seattle, Wa.
>> "Real Radios Glow In The Dark"
>> ----- Original Message -----
>> From: "Pete Lancashire" <pete at petelancashire.com>
>> To: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
>> Cc: "Boatanchors Mail List" <boatanchors at mailman.qth.net>
>> Sent: Wednesday, March 23, 2011 12:31 PM
>> Subject: Re: [Boatanchors] 1625 tube(s)
>>
>>
>>>a side question. If one was building a 40 M xmitter from scratch for
>>> fun would one want to use a 807 or a 1625 ?
>>>
>>> any reason one over the other .. I can't think of any.
>>>
>>> -pete
>>>
>>> On Wed, Mar 23, 2011 at 11:36 AM, Richard Knoppow
>>> <1oldlens1 at ix.netcom.com> wrote:
>>>>
>>>> ----- Original Message -----
>>>> From: "rbethman" <rbethman at comcast.net>
>>>> To: "Boatanchors Mail List" <boatanchors at mailman.qth.net>
>>>> Sent: Wednesday, March 23, 2011 9:34 AM
>>>> Subject: [Boatanchors] 1625 tube(s)
>>>>
>>>>
>>>>> I've had to go back as far as a copy of the 1941 Radio
>>>>> Handbook
>>>>> published by the ARRL to find a "proper" tube diagram that
>>>>> clearly shows
>>>>> the "beam forming plates". However, this stopped at
>>>>> listing of the
>>>>> 1621, (not its diagram.), and it did not list the 1625.
>>>>>
>>>>> This simply leaves myself and others in the *elifIknow*
>>>>> mode!
>>>>>
>>>>> Then again, I have no intent of using 1625s in GG. I
>>>>> don't have a thing
>>>>> here that even uses them. I *DO* have equipment that uses
>>>>> 807s. That
>>>>> would be the BC-610 and the T-213.
>>>>>
>>>>> So we have beat it to death, and find the tube manuals
>>>>> "LACKING"!
>>>>>
>>>>> Bob - N0DGN
>>>>
>>>> FWIW, the RCA receiving tube handbooks all have a
>>>> section describing beam power tubes with a drawing and
>>>> explanation. I am not sure when the standard tube diagrams
>>>> stopped indicating the plates and replaced them with the
>>>> pentode symbol. I thin it was a simplfication of required
>>>> symbols.
>>>> The beam forming plates act in some ways like a virtual
>>>> suppressor grid since the field they produce eliminates
>>>> secondary emission and the negative resistance
>>>> characteristic found in tetrodes. I am not certain what sort
>>>> of characteristics the plates have as far as being able to
>>>> modulate the electron beam. It may be they have enough
>>>> effect to function as a modulation grid or perhaps not. Beam
>>>> pentodes seem to have originated around 1935. They have
>>>> better efficiency than power tubes employing a third grid
>>>> such as the 6F6. The 1625 and 807 are very similar in
>>>> construction to the 6L6 but have plate caps which lowers the
>>>> interelectrod capacitance and extends the maximum frequency
>>>> considerably.
>>>>
>>>>
>>>> --
>>>> Richard Knoppow
>>>> Los Angeles
>>>> WB6KBL
>>>> dickburk at ix.netcom.com
>>>>
>>>> ______________________________________________________________
>>>> Boatanchors mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:Boatanchors at mailman.qth.net
>>>>
>>>> List Administrator: Duane Fischer, W8DBF
>>>> ** For Assistance: dfischer at usol.com **
>>>>
>>>>
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>
>>> ______________________________________________________________
>>> Boatanchors mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Boatanchors at mailman.qth.net
>>>
>>> List Administrator: Duane Fischer, W8DBF
>>> ** For Assistance: dfischer at usol.com **
>>>
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>> ______________________________________________________________
>> Boatanchors mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Boatanchors at mailman.qth.net
>>
>> List Administrator: Duane Fischer, W8DBF
>> ** For Assistance: dfischer at usol.com **
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>
>
>
>
> ------------------------------
>
> Message: 8
> Date: Wed, 23 Mar 2011 16:15:33 -0400
> From: rbethman <rbethman at comcast.net>
> Subject: Re: [Boatanchors] 1625 tube(s)
> To: Boatanchors Mail List <boatanchors at mailman.qth.net>
> Cc: Pete Lancashire <pete at petelancashire.com>
> Message-ID: <4D8A54E5.7020605 at comcast.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Pete, I guess it simply comes down to what power output for filaments
> and which tube you have!
>
> Otherwise I see no difference!
>
> On 3/23/2011 3:31 PM, Pete Lancashire wrote:
>> a side question. If one was building a 40 M xmitter from scratch for
>> fun would one want to use a 807 or a 1625 ?
>>
>> any reason one over the other .. I can't think of any.
>>
>> -pete
>
>
>
> ------------------------------
>
> ______________________________________________________________
> Boatanchors mailing list
> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Boatanchors at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> End of Boatanchors Digest, Vol 86, Issue 49
> ******************************************* 