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SYMPTOMS: - Full output power (sometimes) on 80m only. - Reduced output power only at ca. 50% intermittently (sometimes) and on 80m only. - All other bands operate normally. * When this does occurs, have to adjust the "Plate" to extreme left (out of 80m marking range, different position then when operating normally) to tune that 50% reduced power. Otherwise the transceiver seems to operate normally. Invite ideas on what to look for.

To the greater group, As I begin the project of bringing my FT-101B back to life, I would like to know what one piece of test equipment, other than a multimeter, would you suggest I have in my arsenal to assist in my troubleshooting efforts and to help me bring this radio back to working condition. I recently did a rather thorough inspection of all the replaceable cards as well as the chassis wiring and electronic components. I have discovered about 14 mylar and mica capacitors that will need to be replaced due to cracking. I have received the electrolytic capacitor replacement kit and will start down this road once the other additional caps come in. Is there a single 'gotta have it' piece of gear I should be looking for? I have my eye on a couple of different VTVM's but maybe I should be looking in a different direction. Thoughts and replies are most appreciated and welcomed too. -- Butch - KA?WWT

Hi Everyone, I am currently restoring a 1st generation ft-101 (actually a ft-277...) and while smoke-testing it I found that the RF board may need to be repaired or replaced; Therefore, I have two questions: - Does anybody have a drawing of the PB-1077B board with the parts indicated? (the yaesu manual shows just a few of them) - Apparently the PB-1183 board can also work in an old ft-101, and it can still be found; has anybody tried the replacement? Any help or advice will be appreciated! Best Regards, and Season's greetings to all 73 - Joseph F4JVO

Anyone know the main differences between the 101ZD and FT-101ZSD ?? Does anyone know where I an find schematcs for the FT-101ZSD ??

The lock-ring retainer fell out of the Plate adjustment control in an FT-101ZD, so the vernier didn’t turn the tuning capacitor. Rather than just reinstall the locking ring, I decided to take it apart, clean it and inspect, re-grease, and reassemble, knowing that some very very sticky grease was needed. I used Green Grease, which is quite sticky, but not as sticky as the original. It now turns much easier than those with original grease from Yaesu. The vernier appears to work now, kinda. It slips a little sometimes. So can anybody tell me the name of the original grease that was used and where to obtain it? Thank you, Michael Smith, N4KZO

Hello This is Claudio Bio - OA4BMG from Lima Perú Im performing a maintenance on my 101 and need to clean all wafer switch’s and potentiometers. Here in Perú is not available Deoxit D5 & F5. If I order online, it can not be sent to Perú due customs restrictions. What other options can I have to clean wafer switch’s and potenciometers without any damage. I would really appreciate your suggestions. 73, Claudio OA4BMG

Hello gain This is Claudio Bio - OA4BMG from Lima Perú Durung a inspection on my 101 I found R40 1.5k ohms 5w 10%; this is a Metallic Film resistor. R40 is locate on Main Chassis. If I can’t find it as Metallic Film resistor, what other resistor can be used? I would really appreciate your comments based on your experience.

My FTdx-560 is in need of a 3178.5 Khz USB/CW carrier crystal. I think it's the same as the 101 series, anyone have a source? Thanks.

I'm in need of a 3178.5 Khz USB/CW carrier crystal for my FTdx-560. I believe the FT-101 used the same crystal. Thanks

I’m restoring an FT-101ZD MK0 which has an open-circuit S-meter lamp. Are these 12 volt lamp assemblies with leads still being manufactured? What is everyone replacing these bulbs with? Thank you. 73, Michael Smith, N4KZO

Dear Friends! RX: I have a Sommerkamp FT277ZD MK3, it is the same transceiver like Yaesu FT101ZD MK3 The marker signal is on 1800kHz only S2, but on 1825kHz is S9, on 1850kHz only S2, on 1875kHz is S9, why is so big difference? Is it problem? Other bands the marker signal is about S9. Marker signal level is not good or my transceiver rx is not good on 160m? On 160m I hear the station well if the antenna is on the radio but the noise level is now only S3 on my Sommerkamp FT277ZD and the beacon on 1850kHz is S4, on my IC751A the noise level is S8 and beacon is S9, other bands the two transceiver has the same noise level TX: On 160m and 10m no power output, other bands is ok 100W. On 160m and 10m if I rotate VOX GAIN to MOX the Ic is 50mA, it is ok. But If try to increase the drive level clockwise the Ic is the same, not more, if I rotate the PRESELECTOR it does not matter, no power. Can you help me? I have only multimeter and Diamond SX-100 power/SWR meter. I have an oscilloscope also, but not using it. Thanks: Laszlo ha5bzr

Hello to you all, Recently I bought a Yaesu FT101ZD MK3. It needed a lot of cleaning and was “deaf” due to a blown J310 in the RF unit but everything works fine now except for a strange slow power increase on 40M. I can tune the transceiver to maximum power but it takes about 10 seconds before the output is at its max. When I release the PTT, wait for a few seconds and go back to transmit I have instant full power BUT when I wait for a minute or longer the output power starts at about 25 Watts and slowly (10 seconds) climbs to full power. This happens only on 40M!! I checked and rechecked everything but can’t find anything wrong: - All (HV) voltages OK, changed all HV caps, no change. - Output from the RF unit is stable. - Output on the “rf-out” jack on the back is stable. - Changed driver and PA tubes from my FT902, no change. - Bandswitch is cleaned and all contacts checked with ohm meter. - T/R relay OK. - Aligned the trimmerboards for 40M, no change. - All bands 100W output, 80-90W on 10m. - No ALC indication on the meter. - Checked for cold solder joints in driver and PA unit. The output at the "RF OUT" jack is nice and steady so I suspected that there is something wrong with the (40M) C trimmer board or with a 40M only component in the PA tank circuit. I checked and changed C107, a 620pF ceramic capacitor for a silver mica, no change. I can perfectly align the 40M part of the trimmer board so that one also drops from the list. Today I fed the input of the driver with a signal generator at 7.1 MHz. 20 dBm input gives me 100W output and exactly the same behaviour as described above. So there must be something wrong in the driver of pa unit but only at 40M. I’m really out of options now. This is a video of the 101ZD outputmeter which demonstrates the effect: https://www.youtube.com/watch?v=UpHgFSGevfA Video of the output at the RF JACK on a SA and the slow rising output on a watt meter with 50 Ohms dummy. https://www.youtube.com/shorts/SyqdqOwNehY Who has an idea what's wrong here. Any help will be appreciated. 73's Erwin, PA3DAF (I posted this problem in several other forums but forgot his one)

Hi, I'm looking for a S-Meter for.my FR-101. Thank

Going off some Inrad, Fox Tango and Yaesu data here: I've found filters in 20KHz, 12KHz, 6KHz, 2.4KHz (of various shape factors and pole counts), 1.8KHz, 600Hz, 500Hz and 250Hz bandwidths. Were there any more bandwidths offered? 4KHz, 350Hz, etc.? The 12KHz ones (Tayima P/N TF30H12) also cross to a YF30H12. I cannot find any of these stateside. Perhaps someone has a couple in their junk box? There's an eBay seller in UK who offers them but doesn't ship to the US - and won't return a message about them. Perhaps someone across the pond can help me snag a few? Thanks - 73 Fred, N8YX