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Old 30th Sep 2019, 3:16 am   #1
RestorationRod
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Default EKCO TP-308 restoration

A couple of weeks ago I managed to get an EKCO TP-308 off e-bay for an outlay of 5.00

It was dirty but complete. The plastic top cover and screen bezel were removed and cleaned up a treat. Needless to say a full restoration was required. All of the electrolytic and wax capacitors were replaced. This necessitated the removal of the tube. Fortunately the service instructions tell you how to do this as its required to do an alignment.

Next I traced the wiring from the mains input and found the on/off + volume switch had fallen apart. This was duly replaced and a resistance reading across the heater chain obtained. (including the tube)

A comment at this point. Hold the safety advice guys - I have 50+ years of experience of working on live chassis TV and used to test cables up to 264 kV

So with the HT rectifier mains feed disconnected and using an isolation transformer, switched series incandescent bulb and a variac slowly brought up the voltage. Hoo - flipping - ray!! The valves lit up (series heaters so all or nothing).
Turn off and say Phew!

Next connect in HT rectifier, isolate output and check HT - yup 200v DC + (open circuit)

Turn off - discharge caps and connect HT to rest of set. Attach EHT meter to tube connector, AVO on DC current in series with HT and voltmeter across it.

Turn up variac and .... 12 kV on the tube connector, 195v DC at 200 mA HT and a nice healthy set of heaters. Turn off and say Phew! (again)

Next up tube back in and check for a raster.
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Old 30th Sep 2019, 8:01 am   #2
Nuvistor
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Default Re: EKCO TP-308 restoration

Please could you post some photos, I don’t have a circuit for the TP308 but its probably similar to other Ekco TV’s from that era.
I don’t remember fixing any but we would not have sold many and there is much I have forgotten from 60 years ago.
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Old 30th Sep 2019, 8:16 am   #3
Heatercathodeshort
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Default Re: EKCO TP-308 restoration

Great little portable and as Frank has mentioned, very similar to most Ekco chassis of the 50's. The FM radio also gives a good account of itself.

As with all Ekco models there are a few common faults such as decoupling capacitors and capacitors that look like resistors. Rather than go through the repeats it might be worth searching for EKCO T330/331 on this site's archive. Most of the faults mentioned are listed and apply to the TP308. The CME1402 Mazda picture tube is usually OK. It is a 90 degree type. John. [PS I think this needs to be in the TV section].

Last edited by AC/HL; 30th Sep 2019 at 4:23 pm. Reason: Thanks John, moved.
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Old 30th Sep 2019, 9:11 am   #4
RestorationRod
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Default Re: EKCO TP-308 restoration

I have the full set of circuits and service notes. All components have been checked for the correct value ( I have good H-P in circuit L-C-R tester) and replaced if out of spec. Pots are paxolin or similar and look flimsy. Knobs are integral to the pots and held on with a spire fastener. Very nasty!!. Any old pots that get changed (the vol/on-off already has) will have their knobs cut off and be drilled for 6mm (1/4") shafts and put on the new ones.
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Old 1st Oct 2019, 8:15 am   #5
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Default Re: EKCO TP-308 restoration

Post photos - How?
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Old 1st Oct 2019, 8:17 am   #6
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Default Re: EKCO TP-308 restoration

Does this attach?
Attached Thumbnails
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Old 1st Oct 2019, 8:57 am   #7
Tazman1966
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Default Re: EKCO TP-308 restoration

Attached perfectly.

Good luck! It seems you have a very good start there...
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Old 5th Oct 2019, 4:08 pm   #8
Nuvistor
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Default Re: EKCO TP-308 restoration

This pots with the spire clips were used a lot by Ekco, they did fail like other pots but no more than others.
I found if they required changing it had to the complete control, trying to fit the old spire clip and knob to a new track and wiper was not really successful.
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