^^Can you compare sound of F5 to Stratos (even though it sounds like the latter may not be working any more...)
Stratos is happily working in a smaller house.
I use stratos with Magnepan MGM and I tested F5 with Jordan J92s 48cm MLTL, so I cannot comment on the comparison test yet. But my initial impression is that F5 is better in the area of clarity, detail, and dynamics.
Doug
Red Insulators Kerafol Keratherm
Hello everyone,
I recently received the Red Insulators Kerafol Keratherm, from Zhou Fang, to put in transistors on my F5.
I need your help. The insulator are placed alone or have to put thermal paste?
Best regards,
jpedro
Hello everyone,
I recently received the Red Insulators Kerafol Keratherm, from Zhou Fang, to put in transistors on my F5.
I need your help. The insulator are placed alone or have to put thermal paste?
Best regards,
jpedro
JPedro,
No paste, the whole point is to avoid the mess 🙂
Those have very good heat transfer characteristics.
Enjoy your F5....really great sound !
No paste, the whole point is to avoid the mess 🙂
Those have very good heat transfer characteristics.
Enjoy your F5....really great sound !
Hi CeeVee,
Thank you for your help and the desire for good hearing. I am excited to start building my F5. I already have almost all components and will soon begin construction.
Best regards,
jpedro
Hi Pedro,
nice to hear now you're also into the F5? 😎
(I think we mailed some time ago about OnSemi BJTs)
Have fun, Hannes
nice to hear now you're also into the F5? 😎
(I think we mailed some time ago about OnSemi BJTs)
Have fun, Hannes
Now my F5 has been running almost a week, and I love it!
There was a thread asking what to build after F5, let me ask a similar question.
Which high power amp should an F5-lover build? Say, 75-100W?
Doug
There was a thread asking what to build after F5, let me ask a similar question.
Which high power amp should an F5-lover build? Say, 75-100W?
Doug
Andy: I am interested in buying your Matched Fets: pleae contact me by email or MP... (the reply I received from you is blanked with no text...)
no success for me in getting these insulators: does someone know how to proceed to get them ?
I love this reply !: my F5 project is started; it will have a 850VA transformer (do not tell me it is too big, please 😀) and will have 2 x 90.000µF. I have tried to select the best passive parts (including the big P.S. capacitors) everywhere...
I hope to consolidate my expertise with this F5 to start the Aleph-J-X just after (I have built many devices such as DAC, preamps, etc... but it is the first amp I build
)
Last edited:
Question -
If you wanted to use a pair of CL-60 thermistors for inrush suppression, with a single primary, how would they be wired?
If you wanted to use a pair of CL-60 thermistors for inrush suppression, with a single primary, how would they be wired?
Just to clarify, with a single primary, one thermistor is series with each leg of the primary?
Like this?? --
Like this?? --
Last edited:
Jack - Ok... Can you explain why? Isn't balance good? I guess I don't really know what exactly they are doing
Diagram 2 can be converted to diagram 3 by wiring the transformer up as shown in diagram 1 and adding a double pole double throw switch or a similar relay.
If the relay is triggered by a voltage comparator you can have the start-up condition wired as for 220/240Vac and when the comparator is sure that only 110/120Vac is connected, trigger the relay across to the NO positions and run the transformer at the correct voltage.
If the relay is triggered by a voltage comparator you can have the start-up condition wired as for 220/240Vac and when the comparator is sure that only 110/120Vac is connected, trigger the relay across to the NO positions and run the transformer at the correct voltage.
Andy,
Thank you for the recommendation. I saw your thread of building an Aleph 4, it was quite impressive.
How would you compare your Aleph 4 to F5 for the sound?
Doug
For a single primary just put it in series with one of the primary leads. Thats all you need. Doesnt matter which one it goes on and you only need one. Now be sure that you buy one that can handle the current. Figure the current by V/R when R= the value of resistance when it is under regular operating conditions, not just inrush. The CL60 should be able to handle any inrush current the F5 can put on it, but just in case you were looking at different thermistors I thought I should mention that.
Uriah
Uriah
Last edited:
If you are using a transformer with a single primary, all the current flows around that one primary so you just need one device. If you put the CL-60 on the secondary side you need one EACH before the filter caps of each rail.
This type of inrush current limiter has a somewhat high resistance when cold, when it heats up the resistance drops.
You have to be careful with the model of current limiter you're using -- if you're working with a preamp which is only drawing 100mA you don't use a CL-60 -- see the datasheet.