Evening all, new to tubes (and qiuickly realising it's an even bigger rabbit hole than solid state amps..) so would appreciate any advice. Just collected a Unison Research Unico which came with two sets of valves for the pre-stage.
I've done some research (with the help of Myles' reply below) and edited my original post as I think the CV4003 is a Mullard design military-spec tube, but may not have been manufactured by Mullard?
And 81-32 could be a date code; manufactured in week 32 of 1981?
They also have this etched in the other side but not sure if it's signifcant
631
R1E2
It also seems possible that the Jan Philips set were also an upgrade by a prevoius owner, though much cheaper to buy than the Mullards.
I'll certainly try the amp over the next few days and compare the sound of the two sets, but interested if anyone's got any more info on the CV4003s? Mullard branded ones seem to sell for £150+ on eBay, but I assume mine aren't as desirable?
Not looking to profit from them (in fact at £80 I think I might have overpaid...) but wondered if there's better options for the money they might fetch to get the best out of the amp?
Thanks
Ross
I've done some research (with the help of Myles' reply below) and edited my original post as I think the CV4003 is a Mullard design military-spec tube, but may not have been manufactured by Mullard?
And 81-32 could be a date code; manufactured in week 32 of 1981?
They also have this etched in the other side but not sure if it's signifcant
631
R1E2
It also seems possible that the Jan Philips set were also an upgrade by a prevoius owner, though much cheaper to buy than the Mullards.
I'll certainly try the amp over the next few days and compare the sound of the two sets, but interested if anyone's got any more info on the CV4003s? Mullard branded ones seem to sell for £150+ on eBay, but I assume mine aren't as desirable?
Not looking to profit from them (in fact at £80 I think I might have overpaid...) but wondered if there's better options for the money they might fetch to get the best out of the amp?
Thanks
Ross
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