Tube Preamp: How many tubes does it take to .................


My McIntosh Tube Tuner/Preamp has 17 tubes (some for tuner of course).

https://www.ebay.com/itm/275808078607?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338381866&toolid=10001&customid=2bcceb8a-2310-11ee-a804-333735616563

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This EAR 802 Tube Preamp has 14 tubes (and either MM or MC phono)

https://www.ebay.com/itm/275949778364?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338381866&toolid=10001&customid=a2033c2a-230e-11ee-a2d3-636437633039

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Some have as few as 2 and no mention of Hybrid

Some call themselves Hybrid

What _____________________________?

 

elliottbnewcombjr

The Top Conrad-Johnson GAT2 preamp hand only two tubes.  One gain tube per channel.  A MOSFET at the output of each channel controlled and lowered the output impedance.  Their new unit uses four tubes.  A cathode follower on each channel replaces the the MOSFET transistor. 

My current Luxman Cl38u SE has eight tubes five for the preamp and three for the phono. Previously I had a CJ ET3 SE it had only one tube.