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Post by Deleted on Oct 23, 2021 12:50:28 GMT
I am sorting out my man cave, and found a couple of valves that were not in the spares box. I can't remember what they are, and I am struggling to identify them. Valve 1:  The code seems to be 7E68, but I am guessing this is a PCC189 - 7ES8  Yellow print could be "Japan"? So, what make is this PCC189? |
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Post by Deleted on Oct 23, 2021 13:21:20 GMT
Valve 2: A Telefunken...   Diamond on the bottom  I am thinking it is a PCC85. |
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Post by firebottle on Oct 23, 2021 15:41:44 GMT
Valve 1 could be a PCC189, from Japan could be a Matsushita?
Valve 2. All the PCC85's I have have a longer anode than all the PCC88's I have. Looks like an '88.
The '85 heater is a greater voltage than the '88 so plugged into a conventional preamp you could probably see the difference in the heater colour.
However you won't in the KIN because the current is controlled, not the voltage.
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Post by Deleted on Oct 23, 2021 16:31:05 GMT
Thanks Alan.
I have a couple of Matsushita PCC189, so I will dig them out and compare.
I will see if I have any TFK PCC88 to compare. I think most of my PCC88 are of the Siemens variety though.
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Post by Deleted on Oct 23, 2021 17:35:52 GMT
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Post by mikeyb on Oct 23, 2021 18:04:35 GMT
I'm thinking Tesla going by the white text on the first one?
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Post by Deleted on Oct 23, 2021 18:07:09 GMT
I'm thinking Tesla going by the white text on the first one? It is definitely 7E in the first two characters. Difficult to photograph, so difficult to see.. |
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Post by mikeyb on Oct 23, 2021 18:13:03 GMT
So it's 7ES8 which is a USA pcc189 equivalent
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Post by Deleted on Oct 23, 2021 18:28:57 GMT
Yes. A Japanese one…
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Post by Deleted on Oct 23, 2021 18:30:07 GMT
I have just bought another TFK PCC88 to have a pair for the BB3, and a couple more TFK PCC85 for the Kin, as they were cheap.
It is good to have some spares…
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