No appreciable sonic difference between the two sets! You are good to go!
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Get a set of 4 within 5% and you have a GOOD matched set. 10% is not uncommon. Golden Lyon is 10%. Make sure you make your position clear. Not their match YOUR match.. 5%.. NOT 10%
4 pieces within 5% same date stamp. There are just too many out there NOT to get what you paid for. 25-375.00 usd..
RCA BL expensive. 2-400.00 quad
New Russian surplus, 29-69.00 quad. There are some good surplus valves too. A set of 6 gives you two spares. 59-69.00. 10 years of service.. 10 hours a week is 10 years @ 5000 hours..
IF you add a soft start they will last even longer.