Cary SLI80 as just a preamp?

This is the Tech Talk forum, not the “Most Logical”. I was only wondering if I pulled out the power tubes, would it still work as a preamp, and not wear out the power tubes? Thank you Captains Obvious for suggesting I use a real preamp.

The header logo at the top of this page also reads "A discussion forum by Audiogon".

Asking here about removing tubes from your SLI-80 to use it in a way it was not designed to be used, most would simply advise to contact the manufacturer with your serial number. There are cautions in the owners manual about removing the bottom plate, with a logical safety reason for this.

Some designs use filter caps with a sufficient voltage rating to handle no tubes plugged in, then checking B+ voltages, plates, screens. Who knows what’s installed or been changed in your amp since new. Various caps were used in SLI-80s over the years. Since you came to the Tech Talk forum looking for technical information, do you know what’s installed in your amp now? Do you know how to check values? If not, back to logical step#1.

Ok, ok... I’m not that technical to even tell you what is inside the thing, even if I did remove the cover. It was a thought experiment. I would never even try this without lots of members saying no problem. I was hoping more technically minded members would know this answer. I just thought if the power tubes were removed, then it could work as just a preamp to send signal to a different amp without all the heat and wear on the tubes. Thank you Decooney for thinking about this.

Its a good thought experiment and it "could" work with some added investigation and validation of what is inside. And, perhaps the point earlier is it could also be a waste of a good SLI-80 amplifier to use it as a preamp only, long-term. Not saying you would do that, just noting this.

The previous "idea" I brought it up was more related to previously owning a Signature SLI-80 amp with mods, and eventually selling the SLI-80, then went to separates (like you are kinda thinking about now with a separate amp) and discovered how good the SLP-98 preamp is with similar upgrades. If you like your current amp or a future amp, and wanted to go this route, it’s also a great option as another "thought experiment", i.e. non-Tech Talk discussion :). Cary owners discuss this kinda stuff quite a bit branching from one model to the next, fyi.

I too now use completely different brand mono tube amps in combination with my Cary preamp, and pleased with the results. "Thought experiments" and discussion like this can lead to some really cool changes in ones system, fwiw.