2016 HXDA 50 watt blowing 500ma fuses

[DixieRocker]

I own a 2016 PRS HXDA head that has blown the two 500ma fuses on the main board twice now.

It appears to be random as it happened about 6 months apart.

I am using NOS Mullard D getter EL34's that test in the new range on my B&K 707 tester.

Please Help!!!

 

[Tucson Thump]

I own a 2016 PRS HXDA head that has blown the two 500ma fuses on the main board twice now.

It appears to be random as it happened about 6 months apart.

I am using NOS Mullard D getter EL34's that test in the new range on my B&K 707 tester.

Please Help!!!

As there isn't much info about their innards I'd contact PRS and see what Doug says.
BTW, has your B&K 707 ever been refurbished? I only ask because I had a B&K given to me and didn't realize they don't stay accurate forever.