Recent content by JeffMann
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ZMF Aegis Official Thread
What is the purpose of that fuse? Does it protect the amp from damage if the output tubes short? I am asking that question because the Cayin HA300Mk2 amp also has another single fuse near the power cord input, which I presume is there to protect the power supply. However, each 300B tube also has...- JeffMann
- Post #745
- Forum: Headphone Amps (full-size)
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ZMF Aegis Official Thread
My Cayin Ha300Mk2 amp has fuses that will protect the amp from damage if there is a short (or other catastrophic failure) of the output 300B tubes. Why does the Aegis amp not have fuses to protect the amp from damage if the output tubes short? Jeff.- JeffMann
- Post #742
- Forum: Headphone Amps (full-size)
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ZMF Aegis Official Thread
Could you please expand on what you mean by using the term "lifelike" by describing more precisely the specific changes in tonality/timbre that you are experiencing with the Aegis amp that you could not accomplish with the Cayin HA300MK2 amp? Also, now that you are acquiring a greater variety of...- JeffMann
- Post #741
- Forum: Headphone Amps (full-size)
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ZMF Aegis Official Thread
Do you have experience comparing the tonality of the ZMF Aegis amp versus the Cayin HA300Mk2 amp? I realize that the question is complicated by the fact that each amp's tonality will be greatly affected by the choices made when tube rolling. However, can one come to a reasonably valid...- JeffMann
- Post #733
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
They do not have Sylvania 22de4 tubes, only GE and Philips. Jeff.- JeffMann
- Post #6,468
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
I would like to purchase the Sylvania brand of 22de4 tubes (minimum of 4) for my Cayin HA300Mk2 amp - do you know of a seller who I could contact? Jeff.- JeffMann
- Post #6,435
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
What kind of adapter would I need to use to run my Susvara (XLR cable) from the speaker terminals? Could you please provide details? Why would it sound better? I presently never use my Susvara with the Cayin HA300BMK2 because it sounds thin and bright and not full-bodied. I only use my Meze...- JeffMann
- Post #6,366
- Forum: Headphone Amps (full-size)
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ZMF Aegis Official Thread
I have noted that Wes has a pre-production model where the paintwork on the transformers have a lot of turquoise (bluish-green) color mixed with brown and black. Do the post-production models that will become available for sale soon also have this turquoise color? Another question. I am...- JeffMann
- Post #269
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
Do the 6S5S tubes require a different adapter than the Pinnacle tubes? Jeff.- JeffMann
- Post #6,263
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
I have a related question. What effect does deliberate tube mismatching have on the sound quality? For example, let's presume that one takes a single brand of single-triode driver tube (eg. Mullard CV6) and that one one tube example has a transconductance measurement of 3200 microHos with a...- JeffMann
- Post #6,217
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
I have found another source for Pinnacle 6J5GT tubes. https://www.laboratoriomusicale.net/en/6j5gt-pinnacle-nos-triode-tube-selection Note that they are cheaper than Langrex and they offer printed measurements of matching measurements. Jeff.- JeffMann
- Post #6,156
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
I have a question regarding the Pinnacle 6J5GT driver tubes that I purchased from Langrex. I was reading the following piece by Thomas Mayer - http://vinylsavor.blogspot.com/2013/03/tube-of-month-6j5.html He stated that if two of those tubes are used in parallel that it can result in too much...- JeffMann
- Post #6,147
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
I did extra pay to have them matched. If there are no measurements provided on the box or tube, how do I know that they were matched? Jeff.- JeffMann
- Post #6,134
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
I received 4x 6J5GT Pinnacle tubes from Langrex. I requested that the four tubes be matched because I wanted to use them as a matched quad-set in my Cayin HA300MK2 amp. The 4x tubes I received do not have details or any measurements so I have no evidence that they were matched. If you purchased...- JeffMann
- Post #6,130
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
Can these 274b rectifiers be used in a Cayin HA300 amp? Jeff.- JeffMann
- Post #6,076
- Forum: Headphone Amps (full-size)