| Author |
Message |
    
RCI2990
| | Posted on Saturday, March 23, 2002 - 3:19 pm: | 
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Anyone run a Maco base amp?
I saw one today at a local CB shop that im kinda interested in that was a Maco 500. |
jyd
| | Posted on Saturday, March 23, 2002 - 8:32 pm: |
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never heard of a 500.there is a 300 and a 200,and 750.they are great amps i have had a few of them.i wish i wiuld of kept them. |
Bullseye
| | Posted on Saturday, March 23, 2002 - 9:28 pm: |
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Awesome amps. My Dad ran a 300 for years. Talked like nothing you ever saw. |
RCI2990
| | Posted on Saturday, March 23, 2002 - 10:12 pm: |
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Maybe it was a 750! it was repainted black with white letters(it was a good paint job though)but the guy in there said he saw it do well over 750 watts pep on his meter so maybe it WAS a 750 after all.......... |
jyd
| | Posted on Sunday, March 24, 2002 - 9:03 am: |
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good amp |
RCI2990
| | Posted on Sunday, March 24, 2002 - 10:39 am: |
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I was mostly looking for an amp to ge behind a set of browning Mk 3s that im gonna get. |
Scrapiron63
| | Posted on Monday, March 25, 2002 - 3:53 pm: |
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Maco made a 500, don't think they made it very long. It was not as 'big' as the 300 in output, and more of a modulator type. The Maco 300 was 7 tubes, 2 driving 5. The 500 was a 5 tube, 1 driving 4. Like in all their amps, they mostly used 8950 and 2057 tubes in the 500, although some came with 6 volt tubes like the 6LB6. They soon came out with the Super 300, same tube setup as the 500, 1 driving 4, but with the big transformer, and much stronger than the 500, they are capable of 1KW pep. |
jyd
| | Posted on Tuesday, March 26, 2002 - 11:48 am: |
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i have heard of a firebird 500 1 driving 4,but not a maco 500 |
Scrapiron63
| | Posted on Tuesday, March 26, 2002 - 2:49 pm: |
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Maco made a 100 base amp also, did you ever see one of them. It was their first, looked more like an old gas bathroom heater than an amplifier, thats what everyone called them. I have the schematics on the Maco 500, and most all of the Macos. I went to the Maco plant in Memphis several times in the 1970s, watched them being built, and bought several 300s right off the line. The Maco 300 was the best and most popular of the bunch. The 750 was the worst of the bunch, although some of them were very strong, I've seen a few that would flat dead key 1000 watts, and that was on an accurate meter.
Not talking about that 'swing' thing, but the old big ass-kicking keydown carrier. |
Jyd
| | Posted on Tuesday, March 26, 2002 - 3:02 pm: |
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yeah,i have seen maco 100 before.i just came across a kris amp 1 6jg6 driving 2 6lq6 built in fan.someone took the keying transisters out cause one of them wer bad.i am going to take it to someone to fix it.it will sit and idle but it wont key,tubes are good 70% everything else in it looks great.maco 500 must have not been a very good amp,cause i have never seen one.i had a 300 it would do 1200watts the drivers i replaced them with 2057's. |
RCI2990
| | Posted on Tuesday, March 26, 2002 - 10:50 pm: |
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What do you guys think of the fierbird 500 amp?
I found 2 of them too. |
jyd
| | Posted on Wednesday, March 27, 2002 - 8:21 am: |
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there not bad at all |
jyd
| | Posted on Wednesday, March 27, 2002 - 9:18 am: |
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i just got a kris amp 1 6jg6a driveing 2 6lq6's very old |
bruce
| | Posted on Wednesday, March 27, 2002 - 11:43 am: |
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jyd
thoes tubes cost more than my car...scary |
jyd
| | Posted on Wednesday, March 27, 2002 - 2:54 pm: |
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i found 6je6 same as 6lq6, 40.00 new each. |
Scrapiron63
| | Posted on Wednesday, March 27, 2002 - 5:57 pm: |
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Those old Kris amps are good ones. I have one now, its a four tuber, one driving 3, however its in the shop right now, it has a keying problem I couldn't find. It runs 6LQ6s also. You can still find them pretty easy. I've talked to some guys that have been using a cheaper tube in some amps that run the 6LQ6. Its a 6JF6, and new ones just cost about 10 bucks. I'm sure they want do as many watts as the 6LQ6, as they are just a single element tube. But for the difference in price, I could stand a little less keyup. That first 100 watts is what makes the big difference anyway. |
Taz
| | Posted on Wednesday, March 27, 2002 - 6:03 pm: |
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Bruce your car costs less than 120$ hahaha |
jyd
| | Posted on Wednesday, March 27, 2002 - 6:13 pm: |
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its 6je6 and they are suposed to be a better tube |
jyd
| | Posted on Wednesday, March 27, 2002 - 6:16 pm: |
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scrapiron63,how many whats did yours do? |
bruce
| | Posted on Wednesday, March 27, 2002 - 7:03 pm: |
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Guys in my TC-6 transmitting conveter for 6 meters drake used (3) 6jb6's for a MATCHED SET OF 3 FROM THE FACTORY in 1971 they charged the OUTRAGES price of 9.99 now i wish i bought a dozzen sets!.... by the way what is a 1979 full size caddy worth?? |
Taz
| | Posted on Wednesday, March 27, 2002 - 8:58 pm: |
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lol |
jyd
| | Posted on Thursday, March 28, 2002 - 9:03 am: |
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good condition hhhhhmmm 1,000 rough shape 500 |
Scrapiron63
| | Posted on Thursday, March 28, 2002 - 11:54 am: |
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jyd, that old Kris of mine will load up to about 300 watts, the way I drove it, I don't ever put over 2 watts keyup into these old amps, or the transistor types either. Back in the old days, we would drive them with 5-6-8 watts, whatever your radio would do, and peak to the maximum. We later found that was not the best method, especially with the price of tubes now. All that I've listened to sounds better with low key, maybe about half what they are capable of, and let the forward swing do the rest. One exception is the old tube radios, like the Brownings, will sound ok, and not overheat the amps even if they have a 5-6 watt keyup, but then too, they don't have that 30 watt swing like the exports. Some of these meters will not show if you are swinging forward or backward, everything shows forward. If you get a RMS meter to go forward, you know you have good forward swing. scrapiron |
Jyd
| | Posted on Thursday, March 28, 2002 - 5:47 pm: |
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i need a scamatic for mine,could you do me a big favor?scrapiron63,could you look in yours and in the keying circut there are two small round metal can type transisters,could you give me the numbers off of them.thanks |
Scrapiron63
| | Posted on Thursday, March 28, 2002 - 10:33 pm: |
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I looked thur my schematics, the only Kris I have is for the Boomer. It didn't have those transisters. Like I said, mine is in the shop, but I will pick it up in the next day or so. If you don't find the information, I will look in it and send later. |
Bullshipper537
| | Posted on Friday, March 29, 2002 - 1:47 am: |
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JYD: If they are about the diameter of a pencil eraser, they are most likley 2n2905's. If they are smaller than that, they are most likley ecg 123a's. bullshipper 537 Tex. |
Scrapiron63
| | Posted on Friday, March 29, 2002 - 12:51 pm: |
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JYD, I looked at this schematic again for the Kris Boomer, its the little 100 watt box, it runs 2-6JU6s. It does have two transitors, Q1 and Q2.
Q1 is a 2N3702. Q2 is a 2N3567. They may be different for the larger amps. I'll see whats in mine when I get a change to pick it up. |
Jyd
| | Posted on Friday, March 29, 2002 - 4:32 pm: |
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1 is a 2n2905 the othersaya2n221 and i cant read the rest im guesing 2n2219 |
Jyd
| | Posted on Friday, March 29, 2002 - 8:11 pm: |
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this dude already had both of them out,do any of you know if the 2905 goes in front or in back of the keying circut. thanks, jyd |
jyd
| | Posted on Saturday, March 30, 2002 - 9:47 am: |
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anyone |
Jyd
| | Posted on Sunday, March 31, 2002 - 10:16 am: |
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thanks for all your input,307 told me to use 2n2905 in both places.now i just got to strap it for 11 meter. |
SaddleTramp
| | Posted on Saturday, January 04, 2003 - 1:24 am: |
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Trivia....I was there in "73 when Mr. orgill of Majestic Communications got popped by Uncle Charlie for building Maco boxes.....Boy was he Pi!#%d....The brute and mini brute series were awsome! |
Nail Driver
| | Posted on Friday, January 02, 2004 - 2:59 pm: |
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I've had several 300 maco's some come with 2 transformers seven tubes 8950 . These tubes hard to find if you can find them.I bought a new 500 in the 80's had nothing BUT PROBLEMS. The five hundred had one transformer & five 2057 tubes. the 500 did not filter right & did over heat. I have a 300 maco I use now with a few mods I get around 1100 peak watts on a astatic meter driving it with 2watt dead key swinging 90 |
Crafter
| | Posted on Friday, January 02, 2004 - 9:24 pm: |
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What was the output on a Maco Pump anyone know. |
Skywalker975
Junior Member
Username: Skywalker975
Post Number: 38
Registered: 11-2003
| | Posted on Monday, May 14, 2007 - 3:39 am: |
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I'M JUST WONDERING WHAT A MACO 300 IS WORTH NOW DAYS IF IN WORKING CONDITION? |
Tech808
Moderator
Username: Tech808
Post Number: 13691
Registered: 8-2002
| | Posted on Monday, May 14, 2007 - 8:09 am: |
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Skywalker975,
Any used radio equipment be it amps, radios or antennas is only worth what someone is willing to pay for it.
You can always check the internet auction sites for a guideline on what some people are willing to pay for an item.
Lon ~ Tech808 ~ N9CEF
CEF#808 ~ CEF HAM#33 ~ CVC#002
Tech808@copperelectronics.com
|
Patzerozero
Senior Member
Username: Patzerozero
Post Number: 3722
Registered: 7-2004
| | Posted on Monday, May 14, 2007 - 8:57 am: |
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if it needs tubes or repairs, you could be saying-OUCH! it originally used 2-6lb6's & 5-8950's. IF you can find 'em, the 6lb6's are going for about $30 each, & i've seen 8950's approach $90-EACH. there were plenty of substitutions used over the years that are a bit cheaper. |
Skywalker975
Junior Member
Username: Skywalker975
Post Number: 39
Registered: 11-2003
| | Posted on Monday, May 14, 2007 - 3:10 pm: |
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Thanks Lon.
I was just wondering. i have a maco 300 sitting here on my desk and not sure if ill use it or get rid of it. just wanted an option just in case. Thanks again |
Bigwheel
Junior Member
Username: Bigwheel
Post Number: 42
Registered: 10-2005
| | Posted on Saturday, June 16, 2007 - 12:34 pm: |
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I too have a maco 300 and it just sits on the desk also. i hook it up every now and then there good amps just the 8950's are expensive if you can find them. |
