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
The Vintage Audio Section
Quad 303 transisitor specifications
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="mygoggie" data-source="post: 890525" data-attributes="member: 18916"><p>I am restoring a Quad 303, but need the specifications for the transistor TR104.</p><p></p><p>Originally it was a U17229, the service manual then replaced it with ZTX504. Subsequently this was replaced by a BC556B. None which I can obtain today.</p><p></p><p></p><p>My problem is that the specs differ and if I can have the specifications of the U17229, I can match this with one of the many online tools. Currently what I have is</p><p></p><table style='width: 100%'><tr><td>Rating</td><td>ZTX504</td><td>BC556B</td></tr><tr><td>Collector - Emitter Voltage</td><td>-70 VDC</td><td>-65 VDC</td></tr><tr><td>Collector - Base Voltage</td><td>-70 VDC</td><td>-80 VDC</td></tr><tr><td>Emitter - Base Voltage</td><td>-5.0 VDC</td><td>-5.0 VDC</td></tr></table><p></p><p>I see a BCW19 has the same ratings but positive values instead of the above negative values. What are the implications of this???</p><p></p><p>EDIT: Corrected values of the BC556B</p></blockquote><p></p>
[QUOTE="mygoggie, post: 890525, member: 18916"] I am restoring a Quad 303, but need the specifications for the transistor TR104. Originally it was a U17229, the service manual then replaced it with ZTX504. Subsequently this was replaced by a BC556B. None which I can obtain today. My problem is that the specs differ and if I can have the specifications of the U17229, I can match this with one of the many online tools. Currently what I have is [table] [tr] [td]Rating[/td] [td]ZTX504[/td] [td]BC556B[/td] [/tr] [tr] [td]Collector - Emitter Voltage[/td] [td]-70 VDC[/td] [td]-65 VDC[/td] [/tr] [tr] [td]Collector - Base Voltage[/td] [td]-70 VDC[/td] [td]-80 VDC[/td] [/tr] [tr] [td]Emitter - Base Voltage[/td] [td]-5.0 VDC[/td] [td]-5.0 VDC[/td] [/tr] [/table] I see a BCW19 has the same ratings but positive values instead of the above negative values. What are the implications of this??? EDIT: Corrected values of the BC556B [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
The Vintage Audio Section
Quad 303 transisitor specifications
Top