You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

I had this 300a restored about 2 year's ago. I'd like to say everything that could've been done to have it working 100% (probably better than new) except the preamp.
I used it yesterday and left the amplifier and 2340 on for about 8 hours
The preamplifier was in the on position the whole time.
The 300 a's preamplifier is working 100%.
Problem is I can't turn it off.
When it's turned off the receive drops out and unlike last week no keying and un keying will bring the recive back. I appreciate the photo but my lack of knowledge is making it impossible for me to figure out what I need to do in order to bypass the preamp. If it's not too much trouble could you explain or possibly add a couple of circles around that photo where the Jumper needs to be installed? From you reply I'm assuming I'll have to remove the preamps relay then add the jumper. Correct? 73 PS One good thing to come out of this was that since the cover was off the 2340 as I tapped on the recive tubes in order to eliminate weather the receivers dropping out because of a bad too or relay. I made sure everything including the relay was set properly in place, I decided to go and replace the mixing Crystal with a new one I had laying around. I occasionally had to use the Delta tune as some stations would sound off frequency. It's been some time since I could leave the Delta tune in the 12 o'clock position. The old Crystal must've been out of spec as the new one has all my received stations sounding excellent while the Delta tune is in the 12:00 position. Good deal!

<blockquote data-quote="Sonar" data-source="post: 595206" data-attributes="member: 47153">I had this 300a restored about 2 year&#039;s ago. I&#039;d like to say everything that could&#039;ve been done to have it working 100% (probably better than new) except the preamp.I used it yesterday and left the amplifier and 2340 on for about 8 hoursThe preamplifier was in the on position the whole time.The 300 a&#039;s preamplifier is working 100%.Problem is I can&#039;t turn it off.When it&#039;s turned off the receive drops out and unlike last week no keying and un keying will bring the recive back. I appreciate the photo but my lack of knowledge is making it impossible for me to figure out what I need to do in order to bypass the preamp. If it&#039;s not too much trouble could you explain or possibly add a couple of circles around that photo where the Jumper needs to be installed? From you reply I&#039;m assuming I&#039;ll have to remove the preamps relay then add the jumper. Correct? 73 PS One good thing to come out of this was that since the cover was off the 2340 as I tapped on the recive tubes in order to eliminate weather the receivers dropping out because of a bad too or relay. I made sure everything including the relay was set properly in place, I decided to go and replace the mixing Crystal with a new one I had laying around. I occasionally had to use the Delta tune as some stations would sound off frequency. It&#039;s been some time since I could leave the Delta tune in the 12 o&#039;clock position. The old Crystal must&#039;ve been out of spec as the new one has all my received stations sounding excellent while the Delta tune is in the 12:00 position. Good deal!</blockquote>

[QUOTE="Sonar, post: 595206, member: 47153"] I had this 300a restored about 2 year's ago. I'd like to say everything that could've been done to have it working 100% (probably better than new) except the preamp. I used it yesterday and left the amplifier and 2340 on for about 8 hours The preamplifier was in the on position the whole time. The 300 a's preamplifier is working 100%. Problem is I can't turn it off. When it's turned off the receive drops out and unlike last week no keying and un keying will bring the recive back. I appreciate the photo but my lack of knowledge is making it impossible for me to figure out what I need to do in order to bypass the preamp. If it's not too much trouble could you explain or possibly add a couple of circles around that photo where the Jumper needs to be installed? From you reply I'm assuming I'll have to remove the preamps relay then add the jumper. Correct? [SIZE=16px]73 PS One good thing to come out of this was that since the cover was off the 2340 as I tapped on the recive tubes in order to eliminate weather the receivers dropping out because of a bad too or relay. I made sure everything including the relay was set properly in place, I decided to go and replace the mixing Crystal with a new one I had laying around. I occasionally had to use the Delta tune as some stations would sound off frequency. It's been some time since I could leave the Delta tune in the 12 o'clock position. The old Crystal must've been out of spec as the new one has all my received stations sounding excellent while the Delta tune is in the 12:00 position. Good deal![/SIZE] [/QUOTE]

Top Bottom