some tube units, couple ss
https://www.audiogon.com/listings/lisa5hcf-conrad-johnson-premier-17ls-tube -- has ht bypass they call it 'epl'
https://www.audiogon.com/listings/lisa5418-audio-by-van-alstine-transcendence-10-sl-tube -- lower cost option to 'try' tubes - don't let price fool you, it is excellent sounding - not sure if it has ht bypass
https://www.audiogon.com/listings/lisa3a50-ps-audio-bhk-signature-preamp-tube -- has ht bypass
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https://www.audiogon.com/listings/lisa46dg-classe-audio-cp-500-bal-single-ended-preamp-gorgeous-soli... -- you'll need to check on the ht bypass
https://www.audiogon.com/listings/lisa5784-parasound-halo-jc-2-bp-solid-state
https://www.audiogon.com/listings/lisa5hcf-conrad-johnson-premier-17ls-tube -- has ht bypass they call it 'epl'
https://www.audiogon.com/listings/lisa5418-audio-by-van-alstine-transcendence-10-sl-tube -- lower cost option to 'try' tubes - don't let price fool you, it is excellent sounding - not sure if it has ht bypass
https://www.audiogon.com/listings/lisa3a50-ps-audio-bhk-signature-preamp-tube -- has ht bypass
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https://www.audiogon.com/listings/lisa46dg-classe-audio-cp-500-bal-single-ended-preamp-gorgeous-soli... -- you'll need to check on the ht bypass
https://www.audiogon.com/listings/lisa5784-parasound-halo-jc-2-bp-solid-state