[Boatanchors] Viking II Modulation Problem

[Richard W. Solomon]

Problem Solved ...

The simplest answer is usually the right one.
The two 807's that checked good on a TV-7, weren't !!

Replaced them with new ones and we got audio, lots of audio.

Now for some real work.

Thanks to all who responded.

73, Dick, W1KSZ

-----Original Message-----
>From: Jack <wa9nqw at nconnect.net>
>Sent: Oct 10, 2009 2:07 PM
>To: "Richard W. Solomon" <w1ksz at earthlink.net>
>Cc: Carl <km1h at jeremy.mv.com>, Al Parker <anchor at ec.rr.com>, boatanchors at mailman.qth.net
>Subject: Re: [Boatanchors] Viking II Modulation Problem
>
>Are the tube sockets riveted on the chassis or screwed?
>73,
>jack
>
>On Oct 10, 2009, at 1:03 PM, Richard W. Solomon wrote:
>
>> Don't know if it was factory built or a kit, but the physical
>> circuitry matches the schematic in the manual.
>> Beyond that, my Xtal Ball gets cloudy !!
>>
>> 73, Dick, W1KSZ
>>
>> -----Original Message-----
>>> From: Carl <km1h at jeremy.mv.com>
>>> Sent: Oct 10, 2009 1:53 PM
>>> To: Al Parker <anchor at ec.rr.com>, "Richard W. Solomon" <w1ksz at earthlink.net 
>>> >, boatanchors at mailman.qth.net
>>> Subject: Re: [Boatanchors] Viking II Modulation Problem
>>>
>>> If it was factory built it has a chance of being correct and  
>>> unhacked. If it
>>> was a kit than anything is posible.
>>>
>>> Carl
>>> KM1H
>>>
>>>
>>> ----- Original Message -----
>>> From: "Al Parker" <anchor at ec.rr.com>
>>> To: "Richard W. Solomon" <w1ksz at earthlink.net>;
>>> <boatanchors at mailman.qth.net>
>>> Sent: Saturday, October 10, 2009 10:28 AM
>>> Subject: Re: [Boatanchors] Viking II Modulation Problem
>>>
>>>
>>>> Seems like the screens oughta be bypassed originally.
>>>> 73,
>>>> Al, W8UT
>>>> ----- Original Message -----
>>>> From: "Richard W. Solomon" <w1ksz at earthlink.net>
>>>>
>>>>> I decided a scope would help in tracking down why I
>>>>> have low modulation levels.
>>>>> Surprise !! Looking at the Plate and Screen of the
>>>>> second audio stage I get a high level of oscillation
>>>>> as I crank the Gain Pot past about 4 on the dial.
>>>>> I don't see any oscillation on the Grid ??
>>>>>
>>>>> This is the stock Viking II audio circuit, no mods
>>>>> made except to replace the caps.
>>>>>
>>>>> Maybe I should bypass the screen of the second stage ??
>>>>>
>>>>> Any thoughts ??
>>>>>
>>>>> 73, Dick, W1KSZ
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>>
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>