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| Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc. |
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23rd Oct 2019, 11:00 am
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#1 |
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Retired Dormant Member
Join Date: Jan 2012
Location: Blackpool, Lancashire, UK.
Posts: 24
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Revox A700 End of tape sensor
Good Morning,
Could someone offer number to search for on Revox A700 End of tape sensor, or offer a place to buy one that is not Australia Please All the best and thank you from Alan |
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23rd Oct 2019, 11:27 am
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#2 |
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Moderator
Join Date: Feb 2006
Location: Wembley, Middlesex
Posts: 7,224
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Re: Revox A700 End of tape sensor
The diode mentioned in the manual is MRD148. They don't appear to be available anywhere even Ebay doesn't list them.
I cannot see why you couldn't use any opto transistor. Cricklewood stock SFH 206 which could work, or BPW48N. Before you do so, check that R69 hasn't disintegrated and C8 hasn't gone short circuit. Also check Q1 by substitution. |
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23rd Oct 2019, 1:02 pm
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#3 |
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Retired Dormant Member
Join Date: Jan 2012
Location: Blackpool, Lancashire, UK.
Posts: 24
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Re: Revox A700 End of tape sensor
Good Afternoon Michael,
I changed the transistor because it was EB short, I am getting 4.78v from the sensor, to R8 which is suppling a hi to the B of transistor pulling the collector down to zero... Covering the sensor does nothing, so I am assuming it is duff  All the best from Alan |
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23rd Oct 2019, 1:37 pm
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#4 |
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Retired Dormant Member
Join Date: Jan 2012
Location: Blackpool, Lancashire, UK.
Posts: 24
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Re: Revox A700 End of tape sensor
Good Afternoon Michael,
The Sensor you suggested SFH 206 I can buy on ebay, The other one I cant find... But thank you for the information, most welcome All the very best from Alan |
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