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HP 8656A A6 board U1 1020-2933 is bad

Richard Hall Member Profile All Messages By This Member #105088 ?I am repairing a HP 8656A that has an A6 board from an HP 8606B in it. Chip U1 on board A6 has an HP part number of 1820-2933 and the chip is labeled SP8606B. This chip is bad. Question 1. Is SP8606B the correct part number for the HP part number of 1820-2933? Question 2. I have searched for the? SP8606B chip and can not find one for sale without asking for a quote from the obsolete part vendors. Is there an available substitution part number for this chip? Thank you Richard Hall WB4RSO
george edmonds All Messages By This Member #105102 Hi Richard HP part number 1820-2933 is a Plessey Semiconductors SP8606B. This is a 1.3GHz divide by two ECL Logic device. Plessey Semiconductors were manufactured in Swindon UK. Looks like your A6 Board was manufactured and designed at the HP plant in Scotland. Now probably hard to come by. George G6HIG On Friday, 17 April 2020, 00:14:31 BST, Richard Hall <rhall2@...> wrote: ?I am repairing a HP 8656A that has an A6 board from an HP 8606B in it. Chip U1 on board A6 has an HP part number of 1820-2933 and the chip is labeled SP8606B. This chip is bad. Question 1. Is SP8606B the correct part number for the HP part number of 1820-2933? Question 2. I have searched for the? SP8606B chip and can not find one for sale without asking for a quote from the obsolete part vendors. Is there an available substitution part number for this chip? Thank you Richard Hall WB4RSO
george edmonds All Messages By This Member #105103 Hi Again There is a seller in Switzerland with three available, but sit down first, they will cost about $60 each plus shipping. George G6HIG On Friday, 17 April 2020, 00:14:31 BST, Richard Hall <rhall2@...> wrote: ?I am repairing a HP 8656A that has an A6 board from an HP 8606B in it. Chip U1 on board A6 has an HP part number of 1820-2933 and the chip is labeled SP8606B. This chip is bad. Question 1. Is SP8606B the correct part number for the HP part number of 1820-2933? Question 2. I have searched for the? SP8606B chip and can not find one for sale without asking for a quote from the obsolete part vendors. Is there an available substitution part number for this chip? Thank you Richard Hall WB4RSO
Kuba Sunderland-Ober All Messages By This Member #105105 开云体育 And modern ECL divider is probably a good substitute, except it will need an adapter of some sort for the pin out. At those frequencies, the 100K and higher families will be fine. DigiKey sells a bunch of chips that could be a replacement (other than the pinout). Cheers, Kuba toggle quoted message Show quoted text 16 apr. 2020 kl. 9:44 em skrev george edmonds via groups.io <G6HIG@...>: ? Hi Richard HP part number 1820-2933 is a Plessey Semiconductors SP8606B. This is a 1.3GHz divide by two ECL Logic device. Plessey Semiconductors were manufactured in Swindon UK. Looks like your A6 Board was manufactured and designed at the HP plant in Scotland. Now probably hard to come by. George G6HIG On Friday, 17 April 2020, 00:14:31 BST, Richard Hall <rhall2@...> wrote: ?I am repairing a HP 8656A that has an A6 board from an HP 8606B in it. Chip U1 on board A6 has an HP part number of 1820-2933 and the chip is labeled SP8606B. This chip is bad. Question 1. Is SP8606B the correct part number for the HP part number of 1820-2933? Question 2. I have searched for the? SP8606B chip and can not find one for sale without asking for a quote from the obsolete part vendors. Is there an available substitution part number for this chip? Thank you Richard Hall WB4RSO
Richard Hall Member Profile All Messages By This Member #105112 George, Thank you for your reply. After a total of 6 hours searching I just found a seller on the auction site listing Plessey Prescaler/Frequency divider IC's. In the description he listed theSP6806B. He stated that the IC's were NOS from Watkins-Johnson and he is located in Morehead Kentucky, United states. The price is $9.50 each IC. I ordered 2 and will replace the bad one in about 2 weeks. This may be the last problem for the 8656A. I will then move on to the stack of more than 50 pieces of test equipment. That is not counting about 30 Tektronix 7000 plugins. Richard? WB4RSO
Richard Hall Member Profile All Messages By This Member #105113 Kuba, I was thinking about that type of a solution. That would be a complete new learning experience for me. I am expecting to soon need that solution in the future. Richard WB4RSO
Dave McGuire Member Profile All Messages By This Member #105114 Morehead, KY? Bet I know who that is. He will pipe up soon I think.. -Dave toggle quoted message Show quoted text On 4/16/20 10:19 PM, Richard Hall wrote: George, Thank you for your reply. After a total of 6 hours searching I just found a seller on the auction site listing Plessey Prescaler/Frequency divider IC's. In the description he listed theSP6806B. He stated that the IC's were NOS from Watkins-Johnson and he is located in Morehead Kentucky, United states. The price is $9.50 each IC. I ordered 2 and will replace the bad one in about 2 weeks. This may be the last problem for the 8656A. I will then move on to the stack of more than 50 pieces of test equipment. That is not counting about 30 Tektronix 7000 plugins. Richard? WB4RSO -- Dave McGuire, AK4HZ New Kensington, PA
Daun Yeagley All Messages By This Member #105115 I think I know too!? Daun ;-) Get toggle quoted message Show quoted text From: Dave McGuire Sent: Thu Apr 16 23:55:33 EDT 2020 To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] HP 8656A A6 board U1 1020-2933 is bad Morehead, KY? Bet I know who that is. He will pipe up soon I think.. -Dave On 4/16/20 10:19 PM, Richard Hall wrote: George, Thank you for your reply. After a total of 6 hours searching I just found a seller on the auction site listing Plessey Prescaler/Frequency divider IC's. In the description he listed theSP6806B. He stated that the IC's were NOS from Watkins-Johnson and he is located in Morehead Kentucky, United states. The price is $9.50 each IC. I ordered 2 and will replace the bad one in about 2 weeks. This may be the last problem for the 8656A. I will then move on to the stack of more than 50 pieces of test equipment. That is not counting about 30 Tektronix 7000 plugins. Richard? WB4RSO
Jeff Kruth All Messages By This Member #105116 Hey Richard, Just sent you an email to see which Plessey chip you need. Please verify! 73 Jeff Kruth WA3ZKR In a message dated 4/16/2020 11:54:05 PM Eastern Standard Time, rhall2@... writes: George, Thank you for your reply. After a total of 6 hours searching I just found a seller on the auction site listing Plessey Prescaler/Frequency divider IC's. In the description he listed theSP6806B. He stated that the IC's were NOS from Watkins-Johnson and he is located in Morehead Kentucky, United states. The price is $9.50 each IC. I ordered 2 and will replace the bad one in about 2 weeks. This may be the last problem for the 8656A. I will then move on to the stack of more than 50 pieces of test equipment. That is not counting about 30 Tektronix 7000 plugins. Richard? WB4RSO
Dave_G0WBX All Messages By This Member #105118 Joking apart, there seems to have been a minor dump of similar Plessey Semi' parts on a certain web auction site recently.?? I was looking at a similar part number, but a divide by 10/11 chip last night.? More out of curiosity than anything else. It's always worth putting the OEM part number into Google, and see what falls out.? You may get a pleasant surprise, sometimes...? Even try the HP assembly number, seems people are always scrapping HP stuff somewhere and "parting out" the assemblies. 73. Dave (G0WBX) -- Created on and sent from a Unix like PC running and using free and open source software:
Richard Hall Member Profile All Messages By This Member #105129 Dave, Thanks for the suggestion to search by the board assembly number. Richard WB4RSO

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