Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Registered members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Audio and Video Talk
Valves / Vacuum Tubes
Valve microphonics
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support AVForums:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="Mars" data-source="post: 858065" data-attributes="member: 817"><p>Thanks for the article Agaton Sax. I use the EF86 every now and then; as an input valve in push-pull amps, and as a driver of single ended amplifiers. As such I really like it, being representative of a whole family of pentodes. I did not find so much microphonics problems. I did notice in the Mullard 3-3 circuit, that there were quite a few EF86's that did not bias properly in the circuit, and the EL84 ran hot. This circuit relies on the EL84 to bias the EF86, and the EF86 is DC connected to the EL84 input. If the EF86 is off spec, the circuit goes ot of kilter. I was surprised how many of my stock EF86 (russian, phillips, mullard and a few telefunken) did not make the grade.</p><p></p><p>Nevertheless, I will continue to use them in my amps. It is just a matter of tube rolling to find the right match. Not all circuits are as sensitive to EF86 characteristics as the Mullard 3-3</p></blockquote><p></p>
[QUOTE="Mars, post: 858065, member: 817"] Thanks for the article Agaton Sax. I use the EF86 every now and then; as an input valve in push-pull amps, and as a driver of single ended amplifiers. As such I really like it, being representative of a whole family of pentodes. I did not find so much microphonics problems. I did notice in the Mullard 3-3 circuit, that there were quite a few EF86's that did not bias properly in the circuit, and the EL84 ran hot. This circuit relies on the EL84 to bias the EF86, and the EF86 is DC connected to the EL84 input. If the EF86 is off spec, the circuit goes ot of kilter. I was surprised how many of my stock EF86 (russian, phillips, mullard and a few telefunken) did not make the grade. Nevertheless, I will continue to use them in my amps. It is just a matter of tube rolling to find the right match. Not all circuits are as sensitive to EF86 characteristics as the Mullard 3-3 [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
Valves / Vacuum Tubes
Valve microphonics
Top