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| Thread ID: 123833 | 2012-03-19 07:26:00 | Looking for a Valve for an old type Gulbransen Valve Radio | Bobh (5192) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1265858 | 2012-03-20 03:35:00 | Yes I noticed the scratches in the photo. The writing is very worn out but could be SY WANIA and below is Made in USA. That's SYLVANIA - an old radio company in the US. |
SurferJoe46 (51) | ||
| 1265859 | 2012-03-20 03:38:00 | EDIT::: www.radiomuseum.org www.radio-restoration.com www.radioremembered.org And ---- the Sylvania tube substitution manual::: www.google.com ubeSubstitutionManual-1953.pdf&ei=S_tnT4jtBsmLiALbz-37Bg&usg=AFQjCNGNugmigSLZSyoI4jHyqK6ZMimhIA&sig2=y7oQw0vsWzLKUQ8qCnWy6Q |
SurferJoe46 (51) | ||
| 1265860 | 2012-03-20 04:10:00 | How many pins are there on the base? Is there a connector at the top? I have some old valves and will have a look. Jaycars Electrical import Russian replicas of old valves, they may be able to help if you can identify it. |
mzee (3324) | ||
| 1265861 | 2012-03-20 08:38:00 | How many pins are there on the base? Is there a connector at the top? I have some old valves and will have a look . Jaycars Electrical import Russian replicas of old valves, they may be able to help if you can identify it . Jaycar only import audio valves and very few of them . Regrettably the base won't be any help either because there are many variants of each valve type and while some are plug-in replacements, very few are direct substitutes . Best to do what I suggested, find out the line-up, then it is a safe bet that the type no . for the missing valve will be much easier to identify because they tended to be used in common groupings . A photo of the chassis would almost certainly allow the function of the valve to be identified from its physical location, i . e . what job it is supposed to be doing, then the line-up would give a clue to the type number . Depending on the complexity of the radio, and Gulbransen made reasonably upmarket sets, the lineup might be RF amp, Oscillator/mixer (1 or 2 valves) IF amplifiers (1 or 2 valves), detector/agc, audio output + power rectifier . So, the mix could be anything from 5 to 7-8 valves, and look-alikes are not work-alikes, so you could damage the radio by plugging in the wrong type . Not common, but it could happen . If you are serious, post clear photos and a list of the known types . Brands don't matter, it is the alpha-numeric identifiers that you need to get, and they rub off real easy so don't dust them or wipe them, and hold by the base only . There are tricks to bring up wiped-off numbers, but best not to need them . Cheers Billy 8-{) |
Billy T (70) | ||
| 1265862 | 2012-03-20 08:38:00 | How many pins are there on the base? Is there a connector at the top? I have some old valves and will have a look. Jaycars Electrical import Russian replicas of old valves, they may be able to help if you can identify it. It has seven pins however after looking at the bottom closely there appears to be a hole where an 8th pin should be. Maybe this pin was broken off when the valve was broken so it looks like it should have eight pins.3667 |
Bobh (5192) | ||
| 1265863 | 2012-03-20 09:33:00 | One missing pin is quite common, but it does rule out any with the full 8 pins. Somewhere I have a couple of books on valves, I must look for them. I used to restore valve radios as a hobby. Have you found a model number yet? |
mzee (3324) | ||
| 1265864 | 2012-03-20 10:11:00 | One missing pin is quite common, but it does rule out any with the full 8 pins. Somewhere I have a couple of books on valves, I must look for them. I used to restore valve radios as a hobby. Have you found a model number yet? I have the valve here in Invercargill. My friend has the radio in Gore and is looking for clues inside the radio. |
Bobh (5192) | ||
| 1265865 | 2012-03-20 20:10:00 | Hmmmm, it looks to me, going by the photo, that there could well be a pin broken off? Is there a wire visible by any chance? Anyway, given the state of this Valve, and the fact it was in the Radio when dropped, I’d be inclined to check out the rest of the damage because the way I see it fixing this radio could well come to more than simply replacing a Valve. ;) |
B.M. (505) | ||
| 1265866 | 2012-03-20 20:58:00 | Sorry to be a bit of a doom merchant after all the helpful responses but could I also suggest that you get the remaining valves tested as a dropped radio could also have damaged or broken the filaments on one or more of them. Fingers crossed and hope they are all OK |
bonzo29 (2348) | ||
| 1265867 | 2012-03-21 01:22:00 | One missing pin is quite common, but it does rule out any with the full 8 pins. Somewhere I have a couple of books on valves, I must look for them. I used to restore valve radios as a hobby. Have you found a model number yet? It is not uncommon to find Octal valves with one or more pins missing, especially Octal rectifiers that may only need 5 active pins. They are keyed via the centre spigot so omitting pins saved money over a production run that might have totalled millions, and it does not rule out a valve with the full 8 pins either, the surplus pins are simply not connected to anything. However, and more importantly, I find it most odd that you do not respond with at least one of: a model number (if present), the remaining valve types, the number of valves it has, or even just a photo of the chassis! You might well have had an answer and possibly even an offer of the correct valve type by now if you just took the time to answer those simple questions. I have 800-odd vintage valves and direct access to a catalogue with thousands more, but nothing discourages me more than offering informed opinions and suggestions to a brick wall......... Billy |
Billy T (70) | ||
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