Author |
Message |
Rattletrapp
New member Username: Rattletrapp
Post Number: 1 Registered: 2-2004
| Posted on Wednesday, April 07, 2004 - 11:13 am: |
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I have a tram d201/vox. I cannot turn the mic gain up past the 2oclock position or I get a hum when transmitting. I have tried different mics, Ive even tried keying the radio with no mic and still get the hum.if i turn the mic gain back to 1oclock the hum dissapears i need to be able to turn it up for that big booming tram audio. Please help. thanks:Rattletrapp. ps: i have already nuetralized the finel tube. |
Kc0gxz
Advanced Member Username: Kc0gxz
Post Number: 711 Registered: 3-2003
| Posted on Wednesday, April 07, 2004 - 11:46 pm: |
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Rattletrapp Sounds to me as if you have some electrolitic capacitors on the way out. This is to be expected on old radios such as yours. Replace them all. They're common and a whole lot cheaper than tubes. You'll probably find what you need at RatShack. This is an old radio and it's not uncommon for electrolitics to dry up. Actually, they are nothing more than filters. What you are hearing is an A/C hum and those old electrolitic capacitors are no longer filtering that hum. Jeff, kc0gxz. |
Tech833
Moderator Username: Tech833
Post Number: 621 Registered: 8-2002
| Posted on Thursday, April 08, 2004 - 2:41 pm: |
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Sounds like some leaking caps in the audio amp section. Very common. I have radios from the late 20's through the late 30's that work like new. Not one of them has a single original capacitor in them. For a quick education on old tube radios and how to keep them running forever at maximum performance, see the antique radio site. They have a forum with some real smart people on it. Do a Google search for antique radio forum. It's the first site that pops up. |
Rattletrapp
New member Username: Rattletrapp
Post Number: 2 Registered: 2-2004
| Posted on Thursday, April 08, 2004 - 3:40 pm: |
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Thank you for the info, guess i will be doing some freshening up on the old tram. well its back to the old soldering iron for me. thanks again guys. Rattletrapp. |
Tech833
Moderator Username: Tech833
Post Number: 625 Registered: 8-2002
| Posted on Thursday, April 08, 2004 - 8:11 pm: |
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Find someone in your area that restores antique radios for help. Not only will they probably have a ton of experience and the right parts for you, but they will also likely have the test gear to get your radio aligned and working better than new. |