The second tube I think was made in the US. Phillips bought a factory in New York to be able to sell to the US military, who wanted their tubes to be made in America. At least some of them, they also bought foreign made tubes. I think the factory code is an asterisk *, which indicates the Amperex factory in NY. You can find these factory symbols on page 5 of the pdf. I think it was made in June of 1963. More detail about the labels and construction could nail down the dates.
So I bought a Pro-ject Pre Box RS... (Valve suggestions?)
The Pre Box RS comes from the factory with
Electro Harmonix 6922, on the output stage.
All I have read about this pre has suggested a linear power supply upgrade and tube rolling gives
significantly better results, so the linear PSU is already done (19VDC from a HDPlex 200W).
I've already got some tubes I bought for my old old DAC (it's now 9 years old).
I have a pair of Amperex P.Q 6922 [VCM 163 tested], and a pair of
Phillips E88CC SQ [1109] with writing on the box [12500-12750 and 12400-12500 on the other box] What do those hand written numbers mean?
Anyway, which valves should I likely go with? (I am hoping for longevity as well as quality)
significantly better results, so the linear PSU is already done (19VDC from a HDPlex 200W).
I've already got some tubes I bought for my old old DAC (it's now 9 years old).
I have a pair of Amperex P.Q 6922 [VCM 163 tested], and a pair of
Phillips E88CC SQ [1109] with writing on the box [12500-12750 and 12400-12500 on the other box] What do those hand written numbers mean?
Anyway, which valves should I likely go with? (I am hoping for longevity as well as quality)
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- 14 posts total
- 14 posts total