Quicksilver Mid Mono Tube Rolling

Make sure you turn the bias fully counter clockwise before turning the amps back on if you change the output tubes.    Then after it warms up a minute or two slowly adj bias and check 15 minutes after that and then a few times during the first hour or so to make sure bias is stable....   

I can't say enough good things about Quicksilver.   I bout my amps used about six years ago, they were about a year old and have been rock solid.    Had a few bad tubes, blew a fuse a few times but never a hard failure.

I just bought the Quicksilver Headphone amp and it is built exactly like the Mids....   like a tank.      

The Mid Monos are worth every bit new and are a steal used.... enjoy

I've had V4's on two different occasions, the last time were the balanced version. I had the GED KT 88's. Don't believe I ever changed input tubes. Always enjoyed those amps. I plan to return to one of Mike's amps at one point soon. It could be mid-mono, Sixty watt mono, or mono 120. If I can afford it and they will drive my Harbeth C7's, I'm hoping the Sixty Watt mono may be the answer. I also like the tube choices of the mid-mono and Sixty watt mono better. I'd like to have the EL 34, KT 77, KT 88 options. The mono 120's are more of a KT 150 amp by design, although I believe 88's are ok. 

Also , there are several build revisions of the amp..... the older ones without dual bias pots for each tube can not use KT90 or KT120  like the later ones can.  So be aware of that....   aside from that any EL34 or 6L6 will work for the outputs, but these amps were voiced for the EL34 tube.  

Hi!
I used to have these amp some time go.  Excellent amps! I had great results with these tubes as well NOS 6P3S "Russian 6L6" 

@fjn04 1,385 posts03-20-2020 9:35pm... The mono 120’s are more of a KT 150 amp by design, although I believe 88’s are ok.

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Yes, the QS Mono 120 amplifiers really are designed for KT150s with the larger transformers and higher plate voltages. In my Mono 120s I started wth KT120s, was going to try KT88s next, but Mike @Quicksilver discouraged me from doing so. Popped in a matched quad of KT150s and wallah, never looked back. I’m a diehard EL34 convert now. Like the KT150s more than I thought I would (especially when paired with really good input tubes to sweeten them up). There is a tad more air on top, more weight on bottom, added dynamics - nice linear midrange from KT150s. The real music comes in with good input tubes and 100-200hrs on caps and KT150s. Amazing with electrostatic speakers too. A few other tips to share privately offline.

My Mono 120s were stocked with decent EI 12AU7 inputs and basic JJ 12AT7 driver tubes which sounded decent. Tried a few others. Finally, had to..., 1960s Mullard Blackburns and wow, really nice.

Mid Monos, Mono 60s, Mono 120s. Can’t lose. Point to point, quality build, great value, all very nice. Put a really nice preamp in front of them and they really do compete with amps at 2-3x the price.

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Oh, and, a buddy just bought the Mid Monos. Dropped in some vintage input tubes. The Mid Monos just displaced his higher $ rig now up for sale.