RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair
Skip: Thanks for the antique stove tip. I had searched mica insulator and just found transistor insulators. Mica sheets arrived Friday, and I got the TX fired up today. The amp appears to be very comfortable in the area of 200-250 Watt output. I got it up to 300W at one point but it didn't seem to like that as well. We always ran it at about 200W before when it was in operation. Now I just need to schedule some help to load it in the pickup and then take the 60 mile drive to the repeater site. John Lock kf0m at arrl.net -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of skipp025 Sent: Monday, February 25, 2008 11:08 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Motorola TLD6612A amp repair Hi John, kf0m [EMAIL PROTECTED] wrote: I am working on repair of a TLD6612A 2 meter repeater amp that runs a pair of 8560AS tubes. Should be quite the smokin' signal when you have the amplifeir in line. It worked fine for a number of years and then suffered what appeared to be lightning damage. The insulator between the plate line and the plate tuning disc was arced through among other damage. It is a rectangular piece of clear material that looks like mica. If it is a clearish but dark material it probably is mica. If it's the thicker white insulating material it might be beryllium oxide, which has danger warnings about breathing any dust from the material when drilling or cutting into it. I tried adding some Teflon tape to cover up the puncture. Nope, ain't gonna work. When I fired up the amp today, It arced through again during the tune up process. Anyone have suggestions for a replacement or have one in their junk box? John Lock kf0m at arrl.net Google mica sheet and or look at companies like McMaster Carr. You can often find small sheets and parts at woodstove and appliance repair places/stores. www.antiquestoves.com is one place I found some mica sheeting available on line. And of course I searched mica sheet on Ebay and hit 10 or so supply sources right off the starting line. cheers, s. Yahoo! Groups Links
RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair
Larry, I was not going to make a response to your last but since you have provided your source of information may I then provide mine. It appears that your Motorola sales guy's misled you and that you have unsubstantiated information which you never bothered to verify by reading the manuals or sales literature. As a supervising engineer at Motorola Comm. Div. in the 1960's and 70's I never heard of or ever knew of an Upright Base Station being referred to as a Motrac base station or repeater. In addition, no Upright base never had a xmtr anywhere like the xmtr in a Motrac mobile like you suggest. Also the Upright base never had an H series rcvr. The original LB HB Upright Base had an L rcvr, with an altogether different audio output board and output transistor stage, unlike the audio in a rcvr in a Motrac mobile, and an all transistor one piece control chassis. See HB manual no. 68P81032A70-A. The second version of Upright Base Stations came with an L rcvr in LB an M rcvr in HB both with a modularized control chassis. See LB manual no. 68P81003E25-O and HB manual no. 68P81003E55-A. Motorola also manufactured Upright Base Stations and Multiple - Receiver base stations for use in IMTS telephone operations using 450 MHz M rcvrs. Are these to be called Motrac IMTS stations also? See manual no. 68P81059 A95-B. The only base stations manufactured by Motorola with xmtrs and rcvrs identical to a Motrac mobile were the Compa Station and the Consolette Station in LB, HB, 450 models. For the Compa stations see LB manual no. 68P81005E40-O and HB manual no. 68P81005E80-B. Another Compa Station manufactured but which was not very successful, used the Motran all transistor mobile xmtr and L rcvr. Would you call that a Motrac base because the same rcvr was used in the Motrac mobile with the same channel elements? Just because you found channel elements used in Motrac mobiles identical to those used in the Upright Base does not make the Upright base into a Motrac Base Station. And for the record I have one HB Upright Base Station rptr on 154.xxx MHz, another HB Upright base station, one 450 Upright Base Station, one LB 6M Compa station rptr and two HB Compa stations, as well as several different LB, HB, and 450 Motrac mobiles, in my inventory. I have also a 224.5 MHz repeater which uses a converted 450 xmtr a converted HB M rcvr. Does that make my 224.5 rptr a Motrac rptr? AC [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: OUr local Motorola sales guys always promoted them as MOTRAC series base stations/repeaters, since they used H, L or M series MOTRAC receivers, pretty much the same exciters, the same channel elements, etc. We always knew them in the 2-way shops as MOTRAC base stations, which differentiated them from the later model MICOR series (1971 vintage, etc.) LJ -Original Message- From: Eric Lemmon Sent: Feb 26, 2008 7:11 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair Larry, The Motorola Reference Manual identifies the B93MPB as simply Upright Base Station. It has no nickname. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, February 26, 2008 8:29 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair I have one of the 10-Meter B91LPB stations, uses Motrac receiver, elements, etc. with a PA deck using 2 - 8560A tubes. What Motorola Base Station series would you call the B93MPB station? It's certainly not a MICOR.
RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair
OK Larry, Maybe if you can supply the dimensions of the PA plate line and tuning cap I can help you to get it to get lower to 144 MHz. I have two spare 375 W. PA's and a spare plate line to compare to for dims. Do you have a ham call? AC WA9ZZU [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Wow, looks like I struck a nerve here! So much for believing those fast-talking Motorola sales guys. My point was to find out if it was of the MICOR or MOTRAC era for the PA deck - maybe I should have given a time frame instead (pre-1971, such as my MICOR mobile and station are.) The topic appears occasionally about trying to get the MICOR 1/4 KW VHF stations to work in the lower part of the 2-Meter band (I have one sitting in the garage that I'd like to move to 2M, too), which doesn't ever seem to happen unless it's a factory (or modified to) low-split VHF PA deck. I've heard of people getting the predecessor station (whatever you'd like to call it) which also used a pair of 8560A tubes, I know that people were sometimes successful in moving those to 2-Meters. It becomes a matter of whether you want to spend the money, sometimes. -Original Message- From: allan crites Sent: Feb 27, 2008 9:56 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair Larry, I was not going to make a response to your last but since you have provided your source of information may I then provide mine. It appears that your Motorola sales guy's misled you and that you have unsubstantiated information which you never bothered to verify by reading the manuals or sales literature. As a supervising engineer at Motorola Comm. Div. in the 1960's and 70's I never heard of or ever knew of an Upright Base Station being referred to as a Motrac base station or repeater. In addition, no Upright base never had a xmtr anywhere like the xmtr in a Motrac mobile like you suggest. Also the Upright base never had an H series rcvr. The original LB HB Upright Base had an L rcvr, with an altogether different audio output board and output transistor stage, unlike the audio in a rcvr in a Motrac mobile, and an all transistor one piece control chassis. See HB manual no. 68P81032A70-A. The second version of Upright Base Stations came with an L rcvr in LB an M rcvr in HB both with a modularized control chassis. See LB manual no. 68P81003E25-O and HB manual no. 68P81003E55-A. Motorola also manufactured Upright Base Stations and Multiple - Receiver base stations for use in IMTS telephone operations using 450 MHz M rcvrs. Are these to be called Motrac IMTS stations also? See manual no. 68P81059 A95-B. The only base stations manufactured by Motorola with xmtrs and rcvrs identical to a Motrac mobile were the Compa Station and the Consolette Station in LB, HB, 450 models. For the Compa stations see LB manual no. 68P81005E40-O and HB manual no. 68P81005E80-B. Another Compa Station manufactured but which was not very successful, used the Motran all transistor mobile xmtr and L rcvr. Would you call that a Motrac base because the same rcvr was used in the Motrac mobile with the same channel elements? Just because you found channel elements used in Motrac mobiles identical to those used in the Upright Base does not make the Upright base into a Motrac Base Station. And for the record I have one HB Upright Base Station rptr on 154.xxx MHz, another HB Upright base station, one 450 Upright Base Station, one LB 6M Compa station rptr and two HB Compa stations, as well as several different LB, HB, and 450 Motrac mobiles, in my inventory. I have also a 224.5 MHz repeater which uses a converted 450 xmtr a converted HB M rcvr. Does that make my 224.5 rptr a Motrac rptr? AC [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: OUr local Motorola sales guys always promoted them as MOTRAC series base stations/repeaters, since they used H, L or M series MOTRAC receivers, pretty much the same exciters, the same channel elements, etc. We always knew them in the 2-way shops as MOTRAC base stations, which differentiated them from the later model MICOR series (1971 vintage, etc.) LJ -Original Message- From: Eric Lemmon Sent: Feb 26, 2008 7:11 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair Larry, The Motorola Reference Manual identifies the B93MPB as simply Upright Base Station. It has no nickname. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, February 26, 2008 8:29 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair I have one of the 10-Meter B91LPB stations, uses Motrac receiver, elements, etc. with a PA deck using 2 - 8560A tubes
RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair
Larry, The Motorola Reference Manual identifies the B93MPB as simply Upright Base Station. It has no nickname. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, February 26, 2008 8:29 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair I have one of the 10-Meter B91LPB stations, uses Motrac receiver, elements, etc. with a PA deck using 2 - 8560A tubes. What Motorola Base Station series would you call the B93MPB station? It's certainly not a MICOR.
RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair
If you need another whole amp or transmitter let me know, not interested in taking a working one apart to rob the insulator. tom [Original Message] From: skipp025 [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Date: 2/25/2008 12:08:05 PM Subject: [Repeater-Builder] Re: Motorola TLD6612A amp repair Hi John, kf0m [EMAIL PROTECTED] wrote: I am working on repair of a TLD6612A 2 meter repeater amp that runs a pair of 8560AS tubes. Should be quite the smokin' signal when you have the amplifeir in line. It worked fine for a number of years and then suffered what appeared to be lightning damage. The insulator between the plate line and the plate tuning disc was arced through among other damage. It is a rectangular piece of clear material that looks like mica. If it is a clearish but dark material it probably is mica. If it's the thicker white insulating material it might be beryllium oxide, which has danger warnings about breathing any dust from the material when drilling or cutting into it. I tried adding some Teflon tape to cover up the puncture. Nope, ain't gonna work. When I fired up the amp today, It arced through again during the tune up process. Anyone have suggestions for a replacement or have one in their junk box? John Lock kf0m at arrl.net Google mica sheet and or look at companies like McMaster Carr. You can often find small sheets and parts at woodstove and appliance repair places/stores. www.antiquestoves.com is one place I found some mica sheeting available on line. And of course I searched mica sheet on Ebay and hit 10 or so supply sources right off the starting line. cheers, s. Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.9/1292 - Release Date: 2/21/2008 4:09 PM
Re: [Repeater-Builder] Re: Motorola TLD6612A amp repair
if you have an amp that is tube I would be interested for 2m contact off list merrill kg4idd kg4idd at gmail.com [EMAIL PROTECTED] wrote: What series station is thisTLD6612A amp used in? MICOR? MOTRAC? -Original Message- From: Thomas Oliver Sent: Feb 25, 2008 3:01 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair If you need another whole amp or transmitter let me know, not interested in taking a working one apart to rob the insulator. tom [Original Message] From: skipp025 [EMAIL PROTECTED] mailto:skipp025%40yahoo.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Date: 2/25/2008 12:08:05 PM Subject: [Repeater-Builder] Re: Motorola TLD6612A amp repair Hi John, kf0m [EMAIL PROTECTED] wrote: I am working on repair of a TLD6612A 2 meter repeater amp that runs a pair of 8560AS tubes. Should be quite the smokin' signal when you have the amplifeir in line. It worked fine for a number of years and then suffered what appeared to be lightning damage. The insulator between the plate line and the plate tuning disc was arced through among other damage. It is a rectangular piece of clear material that looks like mica. If it is a clearish but dark material it probably is mica. If it's the thicker white insulating material it might be beryllium oxide, which has danger warnings about breathing any dust from the material when drilling or cutting into it. I tried adding some Teflon tape to cover up the puncture. Nope, ain't gonna work. When I fired up the amp today, It arced through again during the tune up process. Anyone have suggestions for a replacement or have one in their junk box? John Lock kf0m at arrl.net Google mica sheet and or look at companies like McMaster Carr. You can often find small sheets and parts at woodstove and appliance repair places/stores. www.antiquestoves.com is one place I found some mica sheeting available on line. And of course I searched mica sheet on Ebay and hit 10 or so supply sources right off the starting line. cheers, s. Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.9/1292 - Release Date: 2/21/2008 4:09 PM
RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair
Thanks skip I didn't think about looking on E-bay but I also wasn't certain if it was Mica. It is some what clear and brittle and seems to be in thin layers that will flake off. John Lock kf0m at arrl.net -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of skipp025 Sent: Monday, February 25, 2008 11:08 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Motorola TLD6612A amp repair Hi John, kf0m [EMAIL PROTECTED] wrote: I am working on repair of a TLD6612A 2 meter repeater amp that runs a pair of 8560AS tubes. Should be quite the smokin' signal when you have the amplifeir in line. It worked fine for a number of years and then suffered what appeared to be lightning damage. The insulator between the plate line and the plate tuning disc was arced through among other damage. It is a rectangular piece of clear material that looks like mica. If it is a clearish but dark material it probably is mica. If it's the thicker white insulating material it might be beryllium oxide, which has danger warnings about breathing any dust from the material when drilling or cutting into it. I tried adding some Teflon tape to cover up the puncture. Nope, ain't gonna work. When I fired up the amp today, It arced through again during the tune up process. Anyone have suggestions for a replacement or have one in their junk box? John Lock kf0m at arrl.net Google mica sheet and or look at companies like McMaster Carr. You can often find small sheets and parts at woodstove and appliance repair places/stores. www.antiquestoves.com is one place I found some mica sheeting available on line. And of course I searched mica sheet on Ebay and hit 10 or so supply sources right off the starting line. cheers, s. Yahoo! Groups Links
RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair
Sorry I don't know a motrac from a micor. On the other hand I have worked on Mastr pro, execII and mastrII enough to tell the difference between them. 'The exciter is a TLD1372A with a date stamp of May 1974. It runs an 8552 tube and puts out about 10 watts. Based on the model chart in the front of the manual, I would guess this to be a B93MPB series station. Based on the picture in the manual, it is not in the original rack. It does have a control module panel but does not have a receiver. When it is in service, the audio and COR come from our MastrII repeater. John Lock kf0m at arrl.net -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: Monday, February 25, 2008 5:17 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair What series station is thisTLD6612A amp used in? MICOR? MOTRAC? -Original Message- From: Thomas Oliver Sent: Feb 25, 2008 3:01 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair If you need another whole amp or transmitter let me know, not interested in taking a working one apart to rob the insulator. tom [Original Message] From: skipp025 [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Date: 2/25/2008 12:08:05 PM Subject: [Repeater-Builder] Re: Motorola TLD6612A amp repair Hi John, kf0m [EMAIL PROTECTED] wrote: I am working on repair of a TLD6612A 2 meter repeater amp that runs a pair of 8560AS tubes. Should be quite the smokin' signal when you have the amplifeir in line. It worked fine for a number of years and then suffered what appeared to be lightning damage. The insulator between the plate line and the plate tuning disc was arced through among other damage. It is a rectangular piece of clear material that looks like mica. If it is a clearish but dark material it probably is mica. If it's the thicker white insulating material it might be beryllium oxide, which has danger warnings about breathing any dust from the material when drilling or cutting into it. I tried adding some Teflon tape to cover up the puncture. Nope, ain't gonna work. When I fired up the amp today, It arced through again during the tune up process. Anyone have suggestions for a replacement or have one in their junk box? John Lock kf0m at arrl.net Google mica sheet and or look at companies like McMaster Carr. You can often find small sheets and parts at woodstove and appliance repair places/stores. www.antiquestoves.com is one place I found some mica sheeting available on line. And of course I searched mica sheet on Ebay and hit 10 or so supply sources right off the starting line. cheers, s. Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.9/1292 - Release Date: 2/21/2008 4:09 PM
RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair
The base station referred to here was identified by Motorola as being an Upright Base Station, the LB xmtr had a 330 W. RF PA, and the HB xmtr was 375 W. RF PA. The only part of the Upright Station which even only closely resembled the Motrac mobile was the rcvr casting. And just because it was manufactured during the same era , the 1960's 70's, it doesn't even begin to be a Motrac series radio. The only HB base station made by Motorola which used a Motrac xmtr and rcvr was the 110 W. Compa Station. Allan Crites WA9ZZU [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Thanks for the info. That's a MOTRAC series radio. -Original Message- From: kf0m Sent: Feb 25, 2008 7:26 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair  Sorry I don't know a motrac from a micor. On the other hand I have worked on Mastr pro, execII and mastrII enough to tell the difference between them. 'The exciter is a TLD1372A with a date stamp of May 1974. It runs an 8552 tube and puts out about 10 watts. Based on the model chart in the front of the manual, I would guess this to be a B93MPB series station. Based on the picture in the manual, it is not in the original rack. It does have a control module panel but does not have a receiver. When it is in service, the audio and COR come from our MastrII repeater. John Lock kf0m at arrl.net -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: Monday, February 25, 2008 5:17 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair What series station is thisTLD6612A amp used in? MICOR? MOTRAC? -Original Message- From: Thomas Oliver Sent: Feb 25, 2008 3:01 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Motorola TLD6612A amp repair If you need another whole amp or transmitter let me know, not interested in taking a working one apart to rob the insulator. tom [Original Message] From: skipp025 [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Date: 2/25/2008 12:08:05 PM Subject: [Repeater-Builder] Re: Motorola TLD6612A amp repair Hi John, kf0m [EMAIL PROTECTED] wrote: I am working on repair of a TLD6612A 2 meter repeater amp that runs a pair of 8560AS tubes. Should be quite the smokin' signal when you have the amplifeir in line. It worked fine for a number of years and then suffered what appeared to be lightning damage. The insulator between the plate line and the plate tuning disc was arced through among other damage. It is a rectangular piece of clear material that looks like mica. If it is a clearish but dark material it probably is mica. If it's the thicker white insulating material it might be beryllium oxide, which has danger warnings about breathing any dust from the material when drilling or cutting into it. I tried adding some Teflon tape to cover up the puncture. Nope, ain't gonna work. When I fired up the amp today, It arced through again during the tune up process. Anyone have suggestions for a replacement or have one in their junk box? John Lock kf0m at arrl.net Google mica sheet and or look at companies like McMaster Carr. You can often find small sheets and parts at woodstove and appliance repair places/stores. www.antiquestoves.com is one place I found some mica sheeting available on line. And of course I searched mica sheet on Ebay and hit 10 or so supply sources right off the starting line. cheers, s. Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.9/1292 - Release Date: 2/21/2008 4:09 PM
