Recent content by Brf

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    Does Everything Make a Difference?

    There are over 20,000 FDA approved drugs. The majority of them will do nothing, some will have adverse side affects, and some can be life altering. Audio tweaks are the same, it depends on the patient/system. .
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    VIV Laboratory Rigid Float Tonearm, first experience.

    The magnitude of the skating force will be higher with a traditional overhung tonearm with an offset angle when compared to an underhung tonearm with no offset. With an underhung tonearm, the rotation torque (skating force) is generated only by the tracking angle not been inline with the pivot...
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    Need some help setting up a VPI Fatboy on a Classic 3

    The Classic 3 was not designed to accommodate a 12” tonearm due to the lack of plinth space. VPI later produced the Classic 4 (larger footprint) that could accommodate a 12” tonearm.
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    VPI HR - X Possible upgrades

    Perhaps the most fully loaded HRX available
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    Would you Pay $250 to Hear Specific Equipment at a Dealer?

    Can the $250 deposit be applied to anything in the store? If yes, then I would pay for a demo and if the demo did not materialize into a sale of said products, I would simple buy $250 worth of albums, accessories, software etc. When I visit a B&M and listen to some equipment, I always buy a...
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    VPI Prime ground loop

    90% of the time, the hum is caused by an improper tonearm cable shielding, therefore, allowing for potential RFI/EMI contamination. The VPI tonearm/cartridge wires are enclosed in a copper tube within the 3D printed arm wand. The copper tube is attached by a small wire to the tonearm’s metal...
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    Shootout of Nos 6sn7 tubes

    You need to be careful purchasing 1578 tubes as many NOS sold are actually rejects that did not pass quality control. Some tube dealers will go as far as re-inking the quality control OTK stamp on the metal base. Remember, back in the Cold War days nothing was thrown out. Also, it is...
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    Shootout of Nos 6sn7 tubes

    Thanks, that solves the dull plate mystery. Still an awesome tube
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    Shootout of Nos 6sn7 tubes

    thomask, what is acid etched date code on the 1578 tube that arrived yesterday? The OTK-73 stamp has nothing to do with the date of manufacture.
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    Shootout of Nos 6sn7 tubes

    I own both 70’s and 80’s tubes. The difference is in the plate construction. 1970’s production typically have shinny T-plates and tubes manufactured in the 80s have dull T-plates. Imho, there is very little difference between the two with a slight edge going to the shinny plates based on my...
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    Shootout of Nos 6sn7 tubes

    Thomask, congrats on acquiring a pair of 1578. Looking forward to your full review. The 1578 tube is very detailed and does not smear the instruments together. Some would call this “air”. Imho, the 1578 does not have any short comings. It has a deep bass, fully fleshed out midrange and a...
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    Shootout of Nos 6sn7 tubes

    With respect to the 1578 tube, the date is acid etched at the 6 o’clock position within the Melz factory stamp. The first two are Roman numerals denoting the week of manufactured followed by the year. I posted a picture (difficult to picture) but you ca clearly see the “76”. Hope that helps
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    Shootout of Nos 6sn7 tubes

    A lot of comments regarding the Melz 1578 sounding hot in the treble can be attributed to the early (50’s and 60’s) regular nickel base 6H8C which is often mistaken for a 1578. Regardless of other people’s impressions, you will soon be able to offer your own informed opinion once your 1578...
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    Shootout of Nos 6sn7 tubes

    I’ve been rolling 6sn7 tubes for years and own or have owned almost all the tubes mentioned on this thread. The Tung Sol bgrp are a very nice tubes and I really wanted them to be the holly grail for the price I paid, but they ended up just being a very nice sounding tube. My favourite 6sn7...
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    What are you favorite 845 tubes?

    I currently have quite a few pair of 845. In order of preference: 1. 1941 RCA 845. 2. 1959 United 845W with the JAN-CUE designation and with the getter capsule These two are the best. To my ears, I like the RCA a touch better than the United, but often swap back and forth with various...
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