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
300 nos valves for 3k
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="Steerpike" data-source="post: 473203" data-attributes="member: 807"><p>A "1A1" is a hot wire barretter; essentially a positive temperature thermistor, use for current regulation / limiting.</p><p>Not much use.</p><p></p><p>1A5 is a low voltage output pentode. A few days ago, someone wanted to make a headphone amp from valves and a low voltage supply... this is the valve to do it!</p><p></p><p>1A6 = pentagrid converter, which is the 'mixer' in a superhet radio. Could be good if you want to make a Theremin.</p><p></p><p>"89" I dont know, unless its an EF89 or EBF89. EBF89s were used as phono pre-amps in Hammerstein radiograms. They are remote-cut-off pentodes, so will give a bit of dynamic range compression. Otherwise they were intended as the IF amplifier in radios.</p></blockquote><p></p>
[QUOTE="Steerpike, post: 473203, member: 807"] A "1A1" is a hot wire barretter; essentially a positive temperature thermistor, use for current regulation / limiting. Not much use. 1A5 is a low voltage output pentode. A few days ago, someone wanted to make a headphone amp from valves and a low voltage supply... this is the valve to do it! 1A6 = pentagrid converter, which is the 'mixer' in a superhet radio. Could be good if you want to make a Theremin. "89" I dont know, unless its an EF89 or EBF89. EBF89s were used as phono pre-amps in Hammerstein radiograms. They are remote-cut-off pentodes, so will give a bit of dynamic range compression. Otherwise they were intended as the IF amplifier in radios. [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
Valves / Vacuum Tubes
300 nos valves for 3k
Top