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DENTRON ...
I'm considering a Dentron MLA-2500B amp....
anyone here give me any reccomendations ... etc, what to look for? Also ay good Dentron sites? 73, Clint note..AntiSpam software..remove it to reply...8) |
Do a search. I just did one on Google for "MLA2500 Linear" and got quite a
few. I have my dad's MLA 2500. Haven't used it yet. What I heard is that you NEVER draw grid current. The tubes are easy to kill and very $$$. There is a site with directions how to modify it for other less $ tubes: http://www.svetlana.com/docs/TechBul...hnoteNo14.html I even corresponded with the W6KT who wrote it. Here's a reference: Subject: Dentron MLA2500 QST Article needed (QST May 96) Date: 1 Apr 2001 03:18:30 GMT From: Dick Carroll Organization: hardly any Newsgroups: rec.radio.amateur.homebrew, rec.radio.swap References: 1 , 2 Murray Neece wrote: Hi Doug, go to......www.svetlana.com.....and they have the article in thier archives available right there....if you dont find it,let me know, Ill you a copy....i think I "saved it"somewhere...73 murray PS I have not done the mods to one yet because I keep finding good tubes...and im using an MLA now that will do 1800 really easy...I keep it at 1100 or 600 and figure it to last forever...73 Murray The secret to keeping a MLA2500 alive and in good health is to make sure your antenna stays in good condition and doesn't suddenly go defective and unload the amp while it's on the air, and always monitor the grid current while operating. Anytime you see grid current indicated on the meter, STOP using the amp and investigate to see what went wrong. Keeping the grids healthy is probably the most important single thing you can do to keep the tubes in good shape. Those fragile grids won't stand but a very few watts dissipation. Any visibile grid current while operating on the air is too much, whatever the book says. When loaded right (easily done) mine shows zero grid current at full output. Mine 2500 still has the original tubes and they are still at full output. I used it twice this week in a morning 75 meter group because of rotten conditions. (I usually don't need an amp there.) Dick WØEX. "CLinT" wrote in message ... I'm considering a Dentron MLA-2500B amp.... anyone here give me any reccomendations ... etc, what to look for? Also ay good Dentron sites? 73, Clint note..AntiSpam software..remove it to reply...8) |
Do a search. I just did one on Google for "MLA2500 Linear" and got quite a
few. I have my dad's MLA 2500. Haven't used it yet. What I heard is that you NEVER draw grid current. The tubes are easy to kill and very $$$. There is a site with directions how to modify it for other less $ tubes: http://www.svetlana.com/docs/TechBul...hnoteNo14.html I even corresponded with the W6KT who wrote it. Here's a reference: Subject: Dentron MLA2500 QST Article needed (QST May 96) Date: 1 Apr 2001 03:18:30 GMT From: Dick Carroll Organization: hardly any Newsgroups: rec.radio.amateur.homebrew, rec.radio.swap References: 1 , 2 Murray Neece wrote: Hi Doug, go to......www.svetlana.com.....and they have the article in thier archives available right there....if you dont find it,let me know, Ill you a copy....i think I "saved it"somewhere...73 murray PS I have not done the mods to one yet because I keep finding good tubes...and im using an MLA now that will do 1800 really easy...I keep it at 1100 or 600 and figure it to last forever...73 Murray The secret to keeping a MLA2500 alive and in good health is to make sure your antenna stays in good condition and doesn't suddenly go defective and unload the amp while it's on the air, and always monitor the grid current while operating. Anytime you see grid current indicated on the meter, STOP using the amp and investigate to see what went wrong. Keeping the grids healthy is probably the most important single thing you can do to keep the tubes in good shape. Those fragile grids won't stand but a very few watts dissipation. Any visibile grid current while operating on the air is too much, whatever the book says. When loaded right (easily done) mine shows zero grid current at full output. Mine 2500 still has the original tubes and they are still at full output. I used it twice this week in a morning 75 meter group because of rotten conditions. (I usually don't need an amp there.) Dick WØEX. "CLinT" wrote in message ... I'm considering a Dentron MLA-2500B amp.... anyone here give me any reccomendations ... etc, what to look for? Also ay good Dentron sites? 73, Clint note..AntiSpam software..remove it to reply...8) |
I am not smart enough to know how to remove the anti-spam. Also, I don't why
someone asking for information would not make it simple to get a helpful reply. If I could have replied, I would have told them that the last, the very last, used amplifier to be considered would be a Dentron 2500 A/B. They were great amplifiers in their day, but used ones may have bad caps, and of course, if the tubes are bad, they are impossible to find and when available, one would cost more that your used Henry, Drake , Swan, Heathkit, etc. amplifier. Larry KF9E "CLinT" wrote in message ... I'm considering a Dentron MLA-2500B amp.... anyone here give me any reccomendations ... etc, what to look for? Also ay good Dentron sites? 73, Clint note..AntiSpam software..remove it to reply...8) |
I am not smart enough to know how to remove the anti-spam. Also, I don't why
someone asking for information would not make it simple to get a helpful reply. If I could have replied, I would have told them that the last, the very last, used amplifier to be considered would be a Dentron 2500 A/B. They were great amplifiers in their day, but used ones may have bad caps, and of course, if the tubes are bad, they are impossible to find and when available, one would cost more that your used Henry, Drake , Swan, Heathkit, etc. amplifier. Larry KF9E "CLinT" wrote in message ... I'm considering a Dentron MLA-2500B amp.... anyone here give me any reccomendations ... etc, what to look for? Also ay good Dentron sites? 73, Clint note..AntiSpam software..remove it to reply...8) |
" I'm considering a Dentron MLA-2500B amp.... anyone here give me any reccomendations ... etc, what to look for? Also ay good Dentron sites? As that amp has not been made in many years and not that many were sold I would stay away from it mainly due to the tubes. Find an amp that uses some common tubes that are sold at a more reasonable price. |
" I'm considering a Dentron MLA-2500B amp.... anyone here give me any reccomendations ... etc, what to look for? Also ay good Dentron sites? As that amp has not been made in many years and not that many were sold I would stay away from it mainly due to the tubes. Find an amp that uses some common tubes that are sold at a more reasonable price. |
Ok thanks everyone for their input ... I was under the impression that
the MLA-2500 was a well built amp, and easily modifiable to use less expensive available tubes. I'll do some further research. 73, Clint On Mon, 26 Jan 2004 21:22:33 -0500, "Ralph Mowery" wrote: " I'm considering a Dentron MLA-2500B amp.... anyone here give me any reccomendations ... etc, what to look for? Also ay good Dentron sites? As that amp has not been made in many years and not that many were sold I would stay away from it mainly due to the tubes. Find an amp that uses some common tubes that are sold at a more reasonable price. note..AntiSpam software..remove it to reply...8) |
Ok thanks everyone for their input ... I was under the impression that
the MLA-2500 was a well built amp, and easily modifiable to use less expensive available tubes. I'll do some further research. 73, Clint On Mon, 26 Jan 2004 21:22:33 -0500, "Ralph Mowery" wrote: " I'm considering a Dentron MLA-2500B amp.... anyone here give me any reccomendations ... etc, what to look for? Also ay good Dentron sites? As that amp has not been made in many years and not that many were sold I would stay away from it mainly due to the tubes. Find an amp that uses some common tubes that are sold at a more reasonable price. note..AntiSpam software..remove it to reply...8) |
Ok thanks everyone for their input ... I was under the impression that
the MLA-2500 was a well built amp, and easily modifiable to use less expensive available tubes. I'll do some further research. I would not say it is easy , but I seem to remember that in a 73 Magazine (maybe QST) there was an artical to modify it for one of the single Russian power tubes. Doubt that I would go to that much trouble as there are many of the Heathkit and other amps around that use a pair of the much more rugged 4-400 and 3-500 type tubes. |
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