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  #1  
Old 06-16-2017, 11:59 PM
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duodiode duodiode is offline
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Klein & Hummel FS-4-A circuit wanted.

Hello all.

I have a Klein & Hummel Teletest TV pattern generator model FS-4-A dating from about 1956. I have worked on it, every resistor has been replaced, as they had all gone high or O.C., and all of those Wima capacitors replaced, as they were all very leaky, as well as all electrolytic capacitors. However, it does not work! Tracing out the circuit as best I can revealed that at least one component is missing.
I don't have any service information on this instrument at all, not even a circuit diagram. Radiomuseum.org has a circuit for a FS-4, but that is different. Can anyone out there help me with one please?

Cheers, Stuart

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File Type: jpg D_Klein & Hummel_FS-4-A.jpg (62.4 KB, 29 views)

Last edited by Celt; 06-21-2017 at 10:17 AM.
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Old 06-18-2017, 07:33 AM
kf4rca kf4rca is offline
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Never seen one here in the States probably because its 625. But its probably a clone of an American design of the time. What tubes does it use?
Can you show us an internal picture?
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Old 06-21-2017, 01:16 AM
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Hello kf4rca. I've added it to Radiomuseum.org here:
http://www.radiomuseum.org/r/klein_t...or_fs_4_a.html

The valve line up is; ECC85 ECC85 ECF80 ECC81 ECC82 ECH81 ECC81 ECH81 ECC82 ECC81 EZ81 0A2.

I'll post some internal pictures shortly.
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Old 06-21-2017, 07:20 AM
kf4rca kf4rca is offline
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Twelve tubes!!??

Most American generators of that period were probably 6 tubes.
What does it use for a timebase? Does it have a crystal? It could be bad shutting the whole thing down. I'd check for oscillations in the master oscillator circuit first (assuming you have B+).
Remember, that if it worked before, it can work again.
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Old 06-21-2017, 06:41 PM
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Thanks kf4rca. I've found that the circuit given on Radiomuseum.org for the FS5B is similar in many respects. I'll try to use the value shown on this diagram for the missing component. I'm not getting any RF output either, so I'll have to dismantle the channel selector turret section. I've already done this, to replace all the resistors and an electrolytic. It is a big job! Looking at the circuit there is no master oscillator as such, the bar pattern generators and horizontal synch pulse generator being free-running. The vertical synch pulse generator appears to be locked to the mains frequency. There are also four more generators; R.F., I.F., 5.5 MHz audio subcarrier and audio tone.
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Old Yesterday, 12:42 AM
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Interior picture.

Here is the interior of the instrument.
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File Type: jpg D_Klein & Hummel_FS-4-A_inside.jpg (102.6 KB, 10 views)
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Old Today, 06:45 AM
kf4rca kf4rca is offline
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That's great. I think if you get the RF working that will solve some other problems too. Most likely it's a power supply problem. Very common.
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