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Drifting 608.

MAX All Messages By This Member #48441 I wanted to comment on this but it slipped my so called mind. For the gentleman who was having trouble with a 608 that was drifting and FM-ing I have some suggestions before getting into the RF cage. Check the two power supplies to be sure they are on voltage and free of ripple and other noise. A check with a scope is a must. Be sure the VR reference tube, V15 5651, is igniting. Also check the output from the modulator to be sure it is free of noise. That can most easily be found on the longest filter that comes out from the back near the top of the RF cage. Getting into the RF cage I would replace the 6AB4 tube first. It is the buffer and is a UHF TV tube. I don't know about its lifetime but its cousin the 6AF4 was notorious for a short life. The output of my 608D was weak and replacing this tube brought it back without needing to replace the pencil triodes. Come to think of it I don't remember which model 608 you have. This may be a bum steer. However you can get the pencil triodes and the 6AB4 if you need it from Tube Depot I have no affiliation with this company except to have bought tubes from them. Regards. Max. K 4 O DS. Email: max@... Transistor site Vacuum tube site: Woodworking site Music site: To subscribe to the fun with transistors group send an email to. funwithtransistors-subscribe@... To subscribe to the fun with tubes group send an email to, funwithtubes-subscribe@... To subscribe to the fun with wood group send a blank email to funwithwood-subscribe@... toggle quoted message Show quoted text ----- Original Message ----- From: "Glenn Little WB4UIV" <glennmaillist@...> To: <hp_agilent_equipment@...> Sent: Saturday, December 22, 2012 2:27 PM Subject: Re: [hp_agilent_equipment] Re: HP Oldies. All issues, 1 through 37, of "The Notebook" are archived here: 73 Glenn WB4UIV At 02:41 PM 12/22/2012, you wrote: Hi All I think I can help answer this: At a hamfest last year, I picked up a complete collection of the Boonton Radio Corp publication " The Notebook". This was a periodic publication by Boonton covering products and applications of their various products-- ( A great read BTW..Some day I will scan and post them somewhere --BAMA ???) On the last page of Issue 33, the editor admitted to being HP. " Editors Note: BRC assumes Divisional Status: Boonton Radio Corporation, a subsidiary of the Hewlett-Packard company since 1959, assumed divisional status November 1, 1962. At that time, BRC's name was changed to Boonton Radio Company. The conversion of BRC to a division of the Hewlett-Packard Co. is a part of the over-all program to achieve greater flexibility of the entire HP organization ......... " It goes on to say that William Myers from HP - Palo Alto was named General Manager of the new division. Hope this helps.... Ray Johnson WB0EBG / KE3QY HP Components group 1993-1996 ++++++++++++++++++++============================ --- In hp_agilent_equipment@..., Dave Daniel <kc0wjn@...> wrote: Really? I thought I've seen Boonton instruments younger than that. Did HP keep the Boonton name for a while after the acquisition? Dave On 12/21/2012 2:12 PM, w0eom@... wrote: 1959. the instruments are shown in the HP 1963 catalog. In a message dated 12/21/2012 12:22:30 P.M. Pacific Standard Time, kc0wjn@... <mailto:kc0wjn%40gmail.com> writes: Wow. I didn't know HP bought Boonton. I always liked Boonton instruments, probably because I was born in Boonton. When did HP buy them? ------------------------------------ Yahoo! Groups Links ------------------------------------ Yahoo! Groups Links

#48441

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