Nice video. Thanks for bringing this to my attention. With the Freya noval can you place the 6bq7a tubes in the left buffer stage and 6cg7 in the right gain stage?
@@tubelab194just tried a quad of 1959-1960 6bq7 in my freya noval. I have tried many tubes and these are my favorites. Rca in the buffer and GE in the gain. Thanks
Great video...Demo sounded great as well. This is the first time i have ever heard of this tube. I'll have to try 'em in my 6922/6dj8 preamp. I believe you said these could be used in the Freya + with adapters? So can these tubes actually work in place of a 6sn7 type with adapter? I didn't look up the spec sheet yet but was surprised to hear about the Freya Plus. Unless i misunderstood you.
@@NosEL34 that's correct, it should work just fine in the Freya+ and Freya Noval. The circuits are basically identical, the only difference being one runs octal sockets and the other miniature 9 pin. Caution, we stock the correct adapter, but many adapters being sold are not wired correctly.
That's all Charles knows, he mentioned in the video that it could have been made by any number of quality Japanese manufacturers. We currently have good inventory and will ship close matched pairs. The reason it's so hard to identify the parent factory, is most Japanese tubes are very similar both in build and sonics, AND most of their production was rebranded! Over the years we often pickup bits and pieces of information that lets us more definitively identify each variation and manufacturer.
All 12AU7's will have a similar lineararity, it doesn't matter that much who made them, same for 6SN7's. When you look at the data sheets (including the 6BZ7) and the "Plate Characteristics" of each, you'll notice that they all have fairly linear curves, same as most audio triodes and twin triodes. Obviously there are some minor differences between types and manufacturers. BUT the big difference is the operating point, bias it too cold/hot or with too low or high a B+ and you end up in the weeds (non linear region) on one or both swings. What you want is a nice centre operating point in the linear region. This is something many manufacturers of modern amps, don't get right, in an effort to save on engineering costs, they just borrow an existing circuit. As Kit Amp designers we see bad designs almost everyday. You can actually hear when this happens, one 1/2 of the swing (sine wave) will be slightly distorted, so when someone blats a trumpet a bit loud, you'll notice how it's somewhat distorted, that's because one half of the sine wave is clean and operating in a linear region and the other 1/2 is not.
@@tubelab194 Thank you.. But do you think that the 6BZ7 would work right as a substitute for a 6DJ8 if it is in a Phono section w/ passive RIAA? As an output stage in a 2 stage phono section to be exact..
@@pedrodepacas4335 correct as mentioned in the video. Just because a tube was used originally in an application other than audio, doesn't necessarily mean it won't work well in audio. In fact many of these tubes actually have better specs than audio frequency tubes. The reason for this is amplifying 20hz to 20Khz is relatively easy compared to higher frequency applications.
The quality and the purity of the materials used and how they were outgassed .........as well as the chemistery property of every manufacturer.
Another great video
Great album, I was joyful to discover her a while back. Thanks for the reminder....
Nice video. Thanks for bringing this to my attention. With the Freya noval can you place the 6bq7a tubes in the left buffer stage and 6cg7 in the right gain stage?
@@sopasadena1499 yes you can. If you drop into the store and visit the Freya Novel Sets, you'll see a compatibility chart that Charles developed.
@@tubelab194just tried a quad of 1959-1960 6bq7 in my freya noval. I have tried many tubes and these are my favorites. Rca in the buffer and GE in the gain. Thanks
Great video...Demo sounded great as well. This is the first time i have ever heard of this tube. I'll have to try 'em in my 6922/6dj8 preamp.
I believe you said these could be used in the Freya + with adapters? So can these tubes actually work in place of a 6sn7 type with adapter? I didn't look up the spec sheet yet but was surprised to hear about the Freya Plus. Unless i misunderstood you.
@@NosEL34 that's correct, it should work just fine in the Freya+ and Freya Noval. The circuits are basically identical, the only difference being one runs octal sockets and the other miniature 9 pin. Caution, we stock the correct adapter, but many adapters being sold are not wired correctly.
Great track . Its spelt Josefine though 👍
Can you please give me more information about the Japanese tube😊
That's all Charles knows, he mentioned in the video that it could have been made by any number of quality Japanese manufacturers. We currently have good inventory and will ship close matched pairs. The reason it's so hard to identify the parent factory, is most Japanese tubes are very similar both in build and sonics, AND most of their production was rebranded! Over the years we often pickup bits and pieces of information that lets us more definitively identify each variation and manufacturer.
@@tubelab194 Curious about the text/branding on that Japanese tube. I couldn't make out the details on the video. Thanks!
What is the song called?
All the song info is embedded right on the video.
"In Your Wild Garden".
Are they as llinear as high quality 12AU7’s? Or even octals like 6/12SN7’s?
All 12AU7's will have a similar lineararity, it doesn't matter that much who made them, same for 6SN7's. When you look at the data sheets (including the 6BZ7) and the "Plate Characteristics" of each, you'll notice that they all have fairly linear curves, same as most audio triodes and twin triodes. Obviously there are some minor differences between types and manufacturers. BUT the big difference is the operating point, bias it too cold/hot or with too low or high a B+ and you end up in the weeds (non linear region) on one or both swings. What you want is a nice centre operating point in the linear region. This is something many manufacturers of modern amps, don't get right, in an effort to save on engineering costs, they just borrow an existing circuit. As Kit Amp designers we see bad designs almost everyday. You can actually hear when this happens, one 1/2 of the swing (sine wave) will be slightly distorted, so when someone blats a trumpet a bit loud, you'll notice how it's somewhat distorted, that's because one half of the sine wave is clean and operating in a linear region and the other 1/2 is not.
@@tubelab194 Thank you.. But do you think that the 6BZ7 would work right as a substitute for a 6DJ8 if it is in a Phono section w/ passive RIAA? As an output stage in a 2 stage phono section to be exact..
TV tuner tubes.
@@pedrodepacas4335 correct as mentioned in the video. Just because a tube was used originally in an application other than audio, doesn't necessarily mean it won't work well in audio. In fact many of these tubes actually have better specs than audio frequency tubes. The reason for this is amplifying 20hz to 20Khz is relatively easy compared to higher frequency applications.
@@tubelab194 not a bad thing at all because of their widespread use, they are plentiful to be had for just a few dollars.