We'll send you about 5 to 10 HL2 tubes.
Among them, you can choose HL2, which has less microphonics in your amplifier, and return the remaining tubes to us.
After checking microphonics, if you want to buy more, you can buy it for USD 280 each.
If there is an HL2 with less microphonic quality, you should strongly consider acquiring it as it is a limited stock.
Final quote includes round trip shipping costs and tube maintenance costs.