I followed WA8SAJ's advice for protection.
All my tube rigs "see" a 110/120 INRUSH CURRENT PROTECTOR made by Ameritron.
That is fed by a variac, also suggested by WA8SAJ.
My L4B, though it has step-start, it "sees" a 220/240 ICP from Ameritron.
The latter might be overkill, but is insurance.
73 Ivan Shapiro WK1W
WK1W@ivanshapiro.com
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of
amps-request@contesting.com
Sent: Wednesday, December 27, 2017 12:00 PM
To: amps@contesting.com
Subject: Amps Digest, Vol 180, Issue 43
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When replying, please edit your Subject line so it is more specific
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Today's Topics:
1. Hsu linear (Paul Kraemer)
2. Re: Soft Start (Kim Elmore)
3. Re: Soft Start (Jim W7RY)
4. Re: Soft Start (Kim Elmore)
----------------------------------------------------------------------
Message: 1
Date: Tue, 26 Dec 2017 21:28:55 -0600
From: "Paul Kraemer" <elespe@lisco.com>
To: <amps@contesting.com>
Subject: [Amps] Hsu linear
Message-ID: <2858B0FE81094B68B07EF5EA6D9F4CB1@PaulKraemerPC>
Content-Type: text/plain; charset="utf-8"
Does anyone know if Hsu is still marketing that sweet looking legal limit
amp? Haven?t seen them on ebay lately.
Anybody have one?
Paul K0UYA
------------------------------
Message: 2
Date: Tue, 26 Dec 2017 21:58:12 -0600
From: Kim Elmore <cw_de_n5op@sbcglobal.net>
To: Warren Volz <warren@warrenvolz.com>
Cc: Arnie Pfingst <arnie123@hotmail.com>, amps@contesting.com
Subject: Re: [Amps] Soft Start
Message-ID: <F7B055FA-0728-4C1D-AF1B-EE18056312DA@sbcglobal.net>
Content-Type: text/plain; charset=utf-8
A related question. Once long ago I read that power cycles are very hard on
filaments. Is that also the case with soft starts, or does the soft start
reduce the thermal shock issues?
Kim N5OP
"People that make music together cannot be enemies, at least as long as the
music lasts." -- Paul Hindemith
> On Dec 26, 2017, at 21:08, Warren Volz <warren@warrenvolz.com> wrote:
>
> I?d recommend a step start with fuses. I have w7ry?s board in my sb220 and
the fuses saved me from a bad tube once already.
>
> -Warren
>
>> On Dec 26, 2017, at 8:59 PM, Jim W7RY <jimw7ry@gmail.com> wrote:
>>
>> I recommend 10 Ohms. I use 2 resistors and 2 relays. There are fuses in
series with the resistors to protect them.
>>
>> Why would a cap blowing up cause an issue with a step start circuit?
>>
>> Again, I use 2 resistors and 2 relays on a small circuit board.
>>
>> See:
>>
>>
https://www.ebay.com/itm/282765541853?ssPageName=STRK:MESELX:IT&_trksid=p398
4.m1555.l2649
>>
>> 73
>> Jim W7RY
>>
>>
>>
>>
>>
>> -----Original Message----- From: Arnie Pfingst
>> Sent: Tuesday, December 26, 2017 8:31 PM
>> To: amps@contesting.com
>> Subject: [Amps] Soft Start
>>
>> Once upon a time, i had a capacitor explode upon start up. I've heard
stories for and against adding a soft start circuit to my amplifiers.(Some
say 20 ohm resistors, and others say 30 or 40 ohm.) That and the price of
replacement tubes. In my case i have two TL 922a amps using 3-500z tubes.
>> Both set up on 240vac. What do you all have to say here. Thanks
>> Arnie
>>
>>
>>
>> Sent via the Samsung Galaxy S8 Active, an AT&T 4G LTE smartphone
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
> _______________________________________________
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------------------------------
Message: 3
Date: Wed, 27 Dec 2017 06:25:27 -0600
From: "Jim W7RY" <jimw7ry@gmail.com>
To: "Kim Elmore" <cw_de_n5op@sbcglobal.net>, "Warren Volz"
<warren@warrenvolz.com>
Cc: <amps@contesting.com>
Subject: Re: [Amps] Soft Start
Message-ID: <B734E2BAEFD640EBBBD79F30EEEB4E9A@JimsLaptop>
Content-Type: text/plain; format=flowed; charset="UTF-8";
reply-type=original
Soft start (I call it step start) does reduce filament inrush current. As
long as it's on the filament transformer primary.
Which it is in the SB200, SB220, TL922, L4B and TenTec Titan... And many
others.
73
Jim W7RY
-----Original Message-----
From: Kim Elmore
Sent: Tuesday, December 26, 2017 9:58 PM
To: Warren Volz
Cc: amps@contesting.com
Subject: Re: [Amps] Soft Start
A related question. Once long ago I read that power cycles are very hard on
filaments. Is that also the case with soft starts, or does the soft start
reduce the thermal shock issues?
Kim N5OP
"People that make music together cannot be enemies, at least as long as the
music lasts." -- Paul Hindemith
> On Dec 26, 2017, at 21:08, Warren Volz <warren@warrenvolz.com> wrote:
>
> I?d recommend a step start with fuses. I have w7ry?s board in my sb220 and
> the fuses saved me from a bad tube once already.
>
> -Warren
>
>> On Dec 26, 2017, at 8:59 PM, Jim W7RY <jimw7ry@gmail.com> wrote:
>>
>> I recommend 10 Ohms. I use 2 resistors and 2 relays. There are fuses in
>> series with the resistors to protect them.
>>
>> Why would a cap blowing up cause an issue with a step start circuit?
>>
>> Again, I use 2 resistors and 2 relays on a small circuit board.
>>
>> See:
>>
>>
https://www.ebay.com/itm/282765541853?ssPageName=STRK:MESELX:IT&_trksid=p398
4.m1555.l2649
>>
>> 73
>> Jim W7RY
>>
>>
>>
>>
>>
>> -----Original Message----- From: Arnie Pfingst
>> Sent: Tuesday, December 26, 2017 8:31 PM
>> To: amps@contesting.com
>> Subject: [Amps] Soft Start
>>
>> Once upon a time, i had a capacitor explode upon start up. I've heard
>> stories for and against adding a soft start circuit to my
>> amplifiers.(Some say 20 ohm resistors, and others say 30 or 40 ohm.) That
>> and the price of replacement tubes. In my case i have two TL 922a amps
>> using 3-500z tubes.
>> Both set up on 240vac. What do you all have to say here. Thanks
>> Arnie
>>
>>
>>
>> Sent via the Samsung Galaxy S8 Active, an AT&T 4G LTE smartphone
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
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http://lists.contesting.com/mailman/listinfo/amps
------------------------------
Message: 4
Date: Wed, 27 Dec 2017 09:10:05 -0600
From: Kim Elmore <cw_de_n5op@sbcglobal.net>
To: Jim W7RY <jimw7ry@gmail.com>
Cc: Warren Volz <warren@warrenvolz.com>, amps@contesting.com
Subject: Re: [Amps] Soft Start
Message-ID: <0A49768B-9E08-4B11-B78B-82AC78939F3A@sbcglobal.net>
Content-Type: text/plain; charset=utf-8
Yes, more accurately a step-start. Regardless, that?s reassuring to know!
Kim N5OP
"People that make music together cannot be enemies, at least as long as the
music lasts." -- Paul Hindemith
> On Dec 27, 2017, at 06:25, Jim W7RY <jimw7ry@gmail.com> wrote:
>
> Soft start (I call it step start) does reduce filament inrush current. As
long as it's on the filament transformer primary.
>
> Which it is in the SB200, SB220, TL922, L4B and TenTec Titan... And many
others.
>
> 73
> Jim W7RY
>
>
> -----Original Message----- From: Kim Elmore
> Sent: Tuesday, December 26, 2017 9:58 PM
> To: Warren Volz
> Cc: amps@contesting.com
> Subject: Re: [Amps] Soft Start
>
> A related question. Once long ago I read that power cycles are very hard
on filaments. Is that also the case with soft starts, or does the soft start
reduce the thermal shock issues?
>
> Kim N5OP
>
> "People that make music together cannot be enemies, at least as long as
the music lasts." -- Paul Hindemith
>
>> On Dec 26, 2017, at 21:08, Warren Volz <warren@warrenvolz.com> wrote:
>>
>> I?d recommend a step start with fuses. I have w7ry?s board in my sb220
and the fuses saved me from a bad tube once already.
>>
>> -Warren
>>
>>> On Dec 26, 2017, at 8:59 PM, Jim W7RY <jimw7ry@gmail.com> wrote:
>>>
>>> I recommend 10 Ohms. I use 2 resistors and 2 relays. There are fuses in
series with the resistors to protect them.
>>>
>>> Why would a cap blowing up cause an issue with a step start circuit?
>>>
>>> Again, I use 2 resistors and 2 relays on a small circuit board.
>>>
>>> See:
>>>
>>>
https://www.ebay.com/itm/282765541853?ssPageName=STRK:MESELX:IT&_trksid=p398
4.m1555.l2649
>>>
>>> 73
>>> Jim W7RY
>>>
>>>
>>>
>>>
>>>
>>> -----Original Message----- From: Arnie Pfingst
>>> Sent: Tuesday, December 26, 2017 8:31 PM
>>> To: amps@contesting.com
>>> Subject: [Amps] Soft Start
>>>
>>> Once upon a time, i had a capacitor explode upon start up. I've heard
stories for and against adding a soft start circuit to my amplifiers.(Some
say 20 ohm resistors, and others say 30 or 40 ohm.) That and the price of
replacement tubes. In my case i have two TL 922a amps using 3-500z tubes.
>>> Both set up on 240vac. What do you all have to say here. Thanks
>>> Arnie
>>>
>>>
>>>
>>> Sent via the Samsung Galaxy S8 Active, an AT&T 4G LTE smartphone
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
------------------------------
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------------------------------
End of Amps Digest, Vol 180, Issue 43
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