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BiasPro Feedback 1
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So I finally got to use this yesterday and man am I happy I bought it. Super great tool. Helped greatly. Also, because I bought the 4 probes I found that one of my "matched" pairs was about 10 ma apart. Thanks for such an awesome product. - contentsunknown
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Ken, One was a Q 10 and the last one is a MQ 10. I purchased both since I have 3 benches and sometimes need a meter that can be moved around, hence the MQ 10. As far as your products go, I think you are selling as good of a product as any of the other guys and probably better than most, Allesandro, Weber. I have had their stuff and am constantly repairing it. You seem like a good guy and know what you are doing, so why not give yours a try. BTW, I did order a Compu-Bias for 259.00 and have never received the meter or got my money back. I much rather deal with an individual than some company that just takes your money. - rodgersamps
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Ken, I think it's a great product. Hooked it up to my multimeter and biased Hot Rod and my Deluxe Reverb. Thanks much. - Rich
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Hi Ken , well here's my review and yes i can give your bias meter the thumbs up .. all went well apart from finding out my new "matched" quad of Winged C are actually 13ma apart , though this is really another benefit of doing it yourself in a way as if i took it to a tech unless i was lucky enough for them to have a match for my dud tube i would probably have to pay anyway and take it back to get redone once another tube in range could be sourced , i can match one closer with my old spares to use till a replacement arrives now ..i have also had to wait 2 weeks just to get my amp baised at times so am happy to be doing it myself , was all straight forward and very easy to use and another reason i went with yours even though a cheaper one is available was because im picky about the amp (1995 VHT/ Fryette classic 2x12 combo ) and tone and wanted a precise plate voltage reading so the the optional probe was a no brainer ... i recommened this to anyone with basic electrical knowledge , specifically caps discharge and how amps hold a lethal charge even when unplugged ..if you understand this and are careful where you poke around then biasing / matching your own tubes with this unit is very easy and you'll get your money back in no time ... not to mention no longer having the hassle of drop off / pick up / no amp to use periods .. good stuff , all looks well made and i get the impression you stand behind your product should any probs arise . All good , cheers , Cam ---------------------------------------------------------------------------------------------------------------------------
Hi,I,m very pleased with your Bias Pro it works a treat,I wish to purchase 2 BiasPro 9C leads as my new laney amp runs EL84's, would you send an ivoice.  cheers Graham
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Hi there,  In 1994, I bought one of the first Fender '65 Deluxe Reverb reissues. While it's always sounded very good, it's never been "great". With the recent introduction of better quality 6V6GT tubes, I've been itching to see what I could do with this underappreciated workhorse.
Biasing with the sturdy MQ10 and accessory probes couldn't have been easier. Armed with a cotton cloth to handle the tubes and a small screwdriver to tweak the Fender bias pot, I biased the TungSols in 15 minutes flat. Five minutes of that time was spent reading the included clear instructions on how to successfully bias your output tubes. It's like having a new amp!

If you know how to pull a tube out of your amp, you're halfway there. Even better, it also let me compare the TungSol 6V6GTs to some JJ 6V6S tubes I had laying around. The MQ10 let me tweak my amp in a few minutes. More time playing, less time chasing tone!  Thanks for this great tool.  bc
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Hi Ken, I received the the bias pro for my fender dual showman red knob head which runs 6l6GC power tubes. It also has a port to check the bias in the back but its just a single port which checks the overall bias of all four tubes not individuals.  So using the bias pro with the 8c plugs I followed the directions that you provide with the unit and found that one of my so called matched tubes isn't so matched.   Thanks for the help and a Great product.  Lee Faria
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I recently purchased the quadstage bias pro and I love it. As a novice and a long time tube amp collector the bias pro lets me know exactly what my current is going across my power tubes relating to the overall health of my amps.I currently have 13 point to point fender,vox and marshall amps which translates into a lot of power tubes. I find the tool safe and accurate and wish I would have gotten one sooner. I would recomend this tool to every tube amp owner.  Paul Christman  Green Bay WI
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Hi Ken, I recently purchased your BiasPro 9C-S and I love it! Its built very well and makes biasing an amp so much easier. Before I purchased it I was poking around the amp's circuitry with my multimeter leads to bias the amp. It can get quite difficult only having two hands trying to hold and adjust everything. The BiasPro is really convenient and also much more safe. The instructions that come with it are great, very detailed. It definitely shows the time and quality you put in to making such great products. Thank you, Thomas Maxwell
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Ken, I love this thing. It works great. It can be a money maker matching tubes & doing the bias adjustment. It made a big difference in sound but i followed your instructions specifically. I love the PV8C for checking the actual plate voltage, takes the guess work out of it & don't have to read schematics. i'd recommend this tool to anyone who works with tube amps.  Thank you very much for such a good easy to use product.  Respectfully, Steve
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Ken, I received your bias meter today and just finished bias my amp ! It was just too good to be true ! It was so easy to do and seems so accurate,the reason why I'm saying this is I already have similar biasing meter which was way off compare to your meter ! And another reason why I ordered yours was ,my cayin amp. Anybody who owns this amp knows how ridiculously difficult and dangerously designed for biasing ,especially who doesn't have much experience to begin with ,but it was so easy and fearlessly done I don't feel stupid anymore! I don't know how to thank you for your wonderful product and your first rate service ,I wish everyone who owns Cayin A88t integrated amp finds out about your meter . Once again thank you for your truly great product! Sincerely, Jae
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I recently ordered a Quadstate BiasPro Q10 with two BiasPro 8C bias cables and one BiasPro PV8C plate voltage cable from Ken Koga and A-Sharp Fretworks.  First off I must say that Ken was very helpful and informative helping me with my order and the shipment was very prompt.  When the package came and I opened it the first thing I noticed was the great craftsmanship of the products.  Handmade in the USA by Ken the quality of these biasing tools stand out.  I had never tubed my own amp before and with the easy to understand instructions it couldn't have been easier.  Overall I cannot stress enough the quality and ease of use of these products.  I would recommend them to everyone from the novice to the professional.  Thanks Aaron
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To Ken Koga @ asharpfretworks,  Your Quadstage BiasPro Q10 is a terrific, simple and easy to use bias tool. Both the parts quality and build are excellent. Quality probe sockets that are smooth and easy to insert even in tight sockets. The ability to check four tubes at the same time is a wonderful time and effort saver. Great for checking quads for matching, without the need to power off the amp and move probes. I have been using the Q10 for nearly a year now and it is excellent, and is as accurate as any other method that I have tried.
I liked the Q10 so much, I also bought the MQ10 metered version, and it is also a quality piece of equipment. The MQ10 is even better and easier to use. Great equipment, and a must have for amp techs, or anyone that wants to do their own amp biasing. I really appreciate what you have done at Asharpfretworks, and your awesome customer service.  Thank you very much,  Shimmilou
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Hi Ken,  I purchased one of your 8-pin BiasPro products a couple of weeks ago and finally got around to using it. Just wanted to let you know that the instructions were nice and clear, and it took me no time at all to bias a pair of Sovtek 5881 output tubes in my Engl amp head. Great product, easy to use!  Cheers from Australia!  Philip
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Hi Ken,  The Bias Pro saved my Marshall Handwired Plexi.  I put new Mullard EL34s in her and played it for about a month, and it was sounding a bit edgy on the top end. When I tested the plate voltage and the bias with the MQ10, it turned out I was running those tubes at 95%of its maximum cathode current.  Yikes!!!  Using the Bias Pro I turned it down to about 70%, and probably saved my tubes, and my tranny.  Now it sounds more rounded on the top and the bottom ends, with just the right amount of power tube distortion!  Best regards
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Mr. Ken,  the silverface AB763 amps had a 1000k resistor installed on the bias board
the blackface AB763 amps had a 470k resistor installed on the bias board
I removed the 1000k and installed the 470k and the bias adjusts as it should
your tool is great, allows me to easily swap out tubes and read on my FLUKE meter
I am new to the Fender amp electronics including bias adjust
I had the reissue amp and thought to purchase a vintage amp
With a recap and bias adjust this vintage amp is really a joy
great tone and plenty of power
all the best to you Anson Alexander
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Hello Ken, I received my BiasPro Meter Yesterday and put it straight to work. Using the instructions included with the meter I determined that the plate voltage of my amp was 400 volts...Wow that was quick and easy! so on to setting the bias. The bias setting on my amp was more than double than recommended { I am suprised that nothing had melted all this time! } So, I set the correct bias for my amp using the BiasPro Meter and it has never sounded better!  Just want to say thank you! The BiasPro Meter is easy to use and works as advertised...Money well spent!!!  Cheers! Mark Estes
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Hi Ken, I received the quadstage biaspro a couple weeks back and tried it out today. Having no previous experience at biasing amplifiers everything went smoothly, and I am very satisfied with how my amp responded. The included instructions were clear and summarized the process in a way that was easy to understand. It's good to see someone who takes pride in their work, and I would recommend this product to anyone looking for a high quality biasing tool.  Thanks for the good product support.  Take care, Justin
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Hi Ken,  Just wanted to let you know I received the Quadstage BiasPro MQ10 and was able to bias up my amp for the first time by myself without having to send it off to the amp tech. Very nice tool and so easy to use. The instructions are easy to follow and the info you provide is very helpful. Thanks for making a great bias tool at an affordable price!
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Ken, I recently received a Quadstage BiasPro MQ10 with the full quad setup (4) 8C probes and a PV8C probe. The integrated design of the MQ10 is easy to use and a great value. The quick response to my order email was great and the PayPal invoice made payment a breeze. I had my order in 3 days, thanks for getting that right out to me.

The included documentation is easy to follow and informative.  I had no trouble setting the bias on my Peavey JSX head. It was set fairly cold, sounded good but after biasing the tubes a bit hotter it really kicks butt now. Getting the full quad configuration made the process quicker and easier.

I then checked my Peavey 6505+ combo and after some searching on the internet found that i will have to get a mod done on that amp to be able to adjust the bias. The tubes are running rather cold on that one as well. While Peavey might set the tubes on the cold side they do ship their amps with decent tubes (not cheap ones that need to be replaced immediately).

Thanks Ken for making a great product! The modular design is fantastic. If I need a couple of 9C probes down the line it will be an easy addition.  Sincerely, Joe Roth
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hi ken, just to let you know that your bias pro arrived on fri 24th feb, i am new to valve amps so have never biased vales before, within about 1/2 an hour of opening the box i had read the instructions and biased 2 shanling el34 power amps, this would have been quicker if i hadnt needed to leave the valves to cool between amps,
   this looks a great piece of equipment that you provide and has given me confidence that my amps are running correctly and efficiently.  many thanks keith
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Ken,Your meter probably saved me from frying out a couple of amps.  Those Crates, were way to hot, I adjusted them with your meter and they run great.  The Venus, never did Bias out for me no mateer what we tried and I sent it back to factory.  It needed repair,  it was  a sick amp. Even thouhg it played it was way out of wack.  Bias Pro is one great tool.  Thank You  Mike
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Hi Ken,  Tyson Fiddler here. Just wanted to let you know I recieved my bias probe last week and finally got around biasing my amp. Couldn't be happier with your product. This was my first biasing job so I was a little hesitant but after much research online, I finally decided to give it a try. Everything worked out fine. The amp was actually running quite hot so I backed it off a bit and got a much better sound out of it. I'll be sure to recommend your BiasPro to anyone I come across looking to bias thier amps as well. Positive feedback will be left for you. Thanks.  Tyson
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Hi Ken, I finally got around to biasing my SuperReverb Reissue with the Bias Pro MQ10.  Following your clear and precise instructions the job was easy and fast.  I was very impressed with the quality of the product.  The amp has come alive now.  Thanks for making such a great product.  Steve
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Works great. Easy to use. Just plugged it in to my digital multi-meter, hooked up the amp and the tubes. Piece of cake. After the amp warmed up, the actual biasing took less than 30 seconds. Nice workmanship. I had years of experience repairing tube based electronics in a former career. David
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The tester came yesterday, but no one was home, so I had to pick it up from the P.O. today. Just removed the chassis plugged the tubes into the tester probes and then plugged those into the amp. They each read around 41.7. I have a Germino Club 40 50 watt head. If you've never heard of this brand, Greg Germino builds "Plexi" style amps that are as close to the originals as can possibly be built with todays components. He even sources items that are still manufactured from vendors from that time period. At any rate, the Club 40 is his take on the original JTM-50 and JMP-50. An absolutely wonderful amp.

I'm not sure what his ideal is for biasing tubes for this amp, but I have a call into him. I biased each tube (for now) at 35 ma. I'm going to try this for awhile and make minor adjustments and see what sounds best to my ear.

Your tester is so easy to use. I love the fact that I now don't have to pay to bias tubes. Before, I had to wait 2 to 3 weeks to get it back.  - joeelliso3
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Hi Ken, The MQ10 is great, I checked my JVM I just received,a factory restock and it wasn't even close. The tubes do not come close to matching. I did some tube switching to put the range as close as I could. It sounds so much better. Remember this amp is a new restock amp. I have ordered a new tube set for it. The on line store I got it from wants me to send it back so they can check it out. My MQ10 helped me make my amp usable while waiting for the tubes to make it great. thanks ps please send me 4-BIASPRO 9Cs and 1-BIASPRO PV9C. I want to check a peavey 50-50 thanks again