# BHK 250 Power Amp Tube Query

**URL:** <https://forum.psaudio.com/t/bhk-250-power-amp-tube-query/30765>\
**Category:** Amplifiers\
**Created:** [October 16, 2022, 4:42pm UTC](https://forum.psaudio.com/t/bhk-250-power-amp-tube-query/30765 "2022-10-16T16:42:06Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![vkennedy61](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/vkennedy61/32/41241_2.png) [@vkennedy61](https://forum.psaudio.com/u/vkennedy61)\
**Post date:** [October 16, 2022, 5:00pm UTC](https://forum.psaudio.com/t/bhk-250-power-amp-tube-query/30765/2 "2022-10-16T17:00:46Z")

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> [@BHK Signature 250 or 300 Tube Rolling](https://forum.psaudio.com/t/bhk-signature-250-or-300-tube-rolling/2652):
>
> I understand PS Audio’s tube selection is limited to new tubes. I, however, just purchased three different sets of quads: (1) Siemens ECC88 (6DJ8); (2) Amperex 6922 (Holland) and (3) Amperex ECC88 Bugle Boys with the Halo Getter. Does anyone have experience with these tubes? How long do you have to burn in a tube before listening to them to determine which ones sound better? Any other thoughts on tube rolling? Mark

Everything you ever did/didn’t want to know about 250 tube rolling.

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