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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
The Cayin HA300 amp is so powerful that my volume control is between 7 - 8 o'clock at normal listening levels when using my HD800 headphones. The 170HA is apparently even more powerful. Jeff.- JeffMann
- Post #6,532
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
I found his e-bay listing. I noted that he also has Mullard CV6 tubes for sale at the same price of 100 BP per quad-set. However, his plate current measurements of 19ma seem to be impossible as the best measurements that I have ever seen are ~9 - 10ma. Jeff.- JeffMann
- Post #6,526
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
What is the expected lifespan of the Acme 300B tube and what is the warranty time period? Jeff.- JeffMann
- Post #6,512
- Forum: Headphone Amps (full-size)
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Feedback by 'JeffMann' on listing 'Westinghouse 22DE4s'
Tubes were in very good condition and very well packaged for travel.- JeffMann
- Feedback
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iBasso SR3 — 150Ω version of the SR2
That type A version looks like the spare version with the perforated holes that are larger. My stock SR3 earpads appear to have much smaller perforated holes. Jeff.- JeffMann
- Post #294
- Forum: Headphones (full-size)
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iBasso SR3 — 150Ω version of the SR2
Where do I purchase replacement stock earpads for my iBasso SR3 headphone?- JeffMann
- Post #291
- Forum: Headphones (full-size)
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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)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
You have great influence on me as I have followed your lead in purchasing GEC/Mullard CV6 tubes and Russian 6C8C tubes. So, I have therefore decided to purchase a quad set of these recommended 6J5GT tubes that are being sold by Langtrex. Jeff.- JeffMann
- Post #5,905
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
How do they sound from a musical timbre/tone perspective? Are they warm or clinical/thin/analytical sounding? Jeff.- JeffMann
- Post #5,901
- 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 definitely not recommend any Sophia Electric 300B tube as two of mine failed within <3 months of use. Jeff.- JeffMann
- Post #5,844
- Forum: Headphone Amps (full-size)
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Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
WE and Takatsuki and Elrog are mentioned as 300B tube choices. I know of one very important consideration - the WE 300B tubes have a 5-year warranty, which is priceless considering the cost of replacing a prematurely failed 300B tube. Jeff.- JeffMann
- Post #5,829
- Forum: Headphone Amps (full-size)