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#1
05-03-2023, 10:01 AM
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Pilot tv crt
Ok thinking of getting back into getting a d5-100 b@w electrostatic crt to work in a pilot tv. The hv is compatible the heater voltage is .55v I got that covered but the deflection voltages are different the pilot voltages are well over 100 v but the d5-100 are 30 40v otherwise I think it will work but can these voltages be reduced by means of resistors at the crt pin connection points. Can this actually work if this is the only obstacle. The green tube just don’t cut it.
Last edited by timmy; 05-03-2023 at 10:09 AM. 
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#2
05-03-2023, 12:27 PM
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Yeah Tim I got a NOS green tube for mine and it’s an unsatisfactory compromise. I jumped on a NOS 3KP4 on eBay and paid $300 for it but was refunded when the seller discovered the box was new but the tube was spent. Someone probably got a new tube for their 37, replaced it and put the old one in the box the new one came in. Needless to say I was pretty disappointed ��.
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#3
05-03-2023, 12:38 PM
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#4
05-03-2023, 12:48 PM
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Quote:
 https://www.youtube.com/watch?v=rRZ-IxZ46ng
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#7
05-05-2023, 08:10 AM
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5847 is a pentode. A 12AX7 is a dual triode.
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#8
05-05-2023, 08:39 AM
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12AX7 – High-Mu Twin Triode - generally used as audio pre-amp, very versatile.
12AT7 – Also a Mu Twin Triode, but intended for radio frequency amps, mixers & oscillators. 5847 – Pentode used mostly in IF amps https://frank.pocnet.net/sheets/077/5/5847.pdf https://frank.pocnet.net/sheets/049/1/12AX7A.pdf https://frank.pocnet.net/sheets/093/1/12AT7.pdf
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#9
05-05-2023, 08:55 AM
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#11
05-05-2023, 09:26 AM
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Depends on the application and how it's used in the circuit, 12AT7,12AU7,12AX7, etc, all have the same 9A basing, and will SORT OF work if you mix them up, but in reality, each type was built to work in a specific type of circuit, so it's best to be sure you have the right one in the right area.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#13
05-05-2023, 10:01 AM
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What don’t make sense to me is 2 12ax7 test perfect but only one works. And I got a decent b@w picture on the pilot with the d5-100 crt but there is some biasing going on leaving the focus voltage alittle short.
Last edited by timmy; 05-05-2023 at 10:04 AM.
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#14
05-05-2023, 10:22 AM
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You never said which pilot you had, but from what I can see, the tuner tubes MUST be 12AT7s.
Any else won't work well. https://www.earlytelevision.org/pdf/...sams_62-16.pdf
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#15
05-05-2023, 10:29 AM
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Hybrid Mode
