TJ mesh plate 300B
TJ mesh plate 300B has been our all time favorite since 2000. Why?
You will find the answer in the article from Thorsten Loesch regarding his test on 9 different 300B valves (https://www.enjoythemusic.com/magazine/equipment/1201/300b/).
Is TJ mesh plate 300B reliable?
Yes. We are not just a reseller. We do our own in-house quality control and branding.
Firstly, our test is more accurate than the factory standard test. We do curve tracing test for each tube. The curves can reveal a lot more about the tube, including abnormal behaviors. Therefore we are able to disqualify tubes even though they have passed manufacturer’s test.
Secondly, we play minimum 50 hours for each tube then we do the actual audition, yes do it for EACH tube.
Therefore, we are confident with the quality of our TJ Tubes. “12-month warranty on TJ Tubes” has been our policy since 2000. (Note)
Note: To avail the warranty, (1) the item must be shipped back to our test center in the Philippines. (2) the tubes have been used under normal operating condition. If the buyer has difficulties to send it back, please contact us for a quotation for FedEx pick up. Usually the charge is about $40-$60.
How are the TJ tubes matched?
Our TJ tubes are better matched than the factory matched pair. How come? Just consider this fact – one time we received 10 matched pair from the factory, they are all marked as “65mA”. The “65mA” is all that the factory relies on for matching. But only when we potted the plate current curves of each tubes, that’s the time we could see that the electronic performance of those 20 tubes tubes are actually different from one another. After carefully comparing the curves of those 20 tubes, only 3 to 4 pairs we can consider as “matched pair”. You can hear the difference when the tubes are well matched.
How will the tubes be packed and shipped?
Vacuum tubes are very delicate and prone to shipping damage caused by transit vibration. All couriers throw and drop their parcels, therefore, tube packaging has to be shockproof. And all our big tubes are surrounded by shock-absorbing materials that is in between the inner box and the strong outer box.
Shipping is via FedEx instead of the post office. If you are from the Philippines, we can ship it out by lalamove/JRS.
Curve tracing vs single point test. Tube factories matches tubes based on a single-point measurement. But we performs one to two hundreds mesurements in order to plot the curves. Therefore, our test can reveal tube characteristic that is hidden in other tests. Hidden problems can also be revealed.
Why is matching important for tubes? Each tube is different from one another due to the handmade processing. You may be surprised how two tubes perform differently even though they are labelled as “matched” with the single-point test. But power tubes are so critical that matching them carefully can make the music more alive!
The curves also can reveal problems that is hidden. It can reject problematic tubes in the early stage and reduce defective / return rate. It means it can save you possible future shipping cost.