Re: Topband: Looking for a 2n5109
Hi, There is an equivalent type of 2N5109 available at many sellers. NTE278 with same parameters. Karel OK1CF -Původní zpráva- Od: Topband za uživatele Richard (Rick) Karlquist Odesláno: čtvrtek 22. října 2020 21:44 Komu: Edward stallman ; topband@contesting.com Předmět: Re: Topband: Looking for a 2n5109 On 10/22/2020 9:22 AM, Edward stallman wrote: > I remember about a year ago a discussion not to buy the 2n5109 > transistors from E-Bay sellers . Some searching shows the 2n5109 has > been discontinued for many years . So is anyone that's been saving one > for many years willing to part with it ? I'm using it in a W7IUV pre-amp . > > Thanks Ed N5DG > Mouser has them in and out of stock. I ordered some 6 months ago, and they came in about a month later. Rick N6RK _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Looking for a 2n5109
On 10/22/2020 9:22 AM, Edward stallman wrote: I remember about a year ago a discussion not to buy the 2n5109 transistors from E-Bay sellers . Some searching shows the 2n5109 has been discontinued for many years . So is anyone that's been saving one for many years willing to part with it ? I'm using it in a W7IUV pre-amp . Thanks Ed N5DG Mouser has them in and out of stock. I ordered some 6 months ago, and they came in about a month later. Rick N6RK _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Looking for a 2n5109
Elliott Supply has the 2N5109 in stock: https://www.elliottelectronicsupply.com/transistor-94165.html Paul - W2NMI - Original Message - From: Edward stallman To: topband@contesting.com Sent: Thu, 22 Oct 2020 12:22:34 -0400 (EDT) Subject: Topband: Looking for a 2n5109 I remember about a year ago a discussion not to buy the 2n5109 transistors from E-Bay sellers . Some searching shows the 2n5109 has been discontinued for many years . So is anyone that's been saving one for many years willing to part with it ? I'm using it in a W7IUV pre-amp . Thanks Ed N5DG _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Looking for a 2n5109
Great idea solder leads to the SMD Larry! steve > On Oct 22, 2020, at 11:08 AM, Larry wrote: > > FYI, since the genuine 2N5109 is so difficult to source (and the 2N3866), you > might want to look at using a DCP68. This is a surface mount device that will > electrically replace the 2N5109 in the W7IUV preamp provided you don't need > to operate it at frequencies higher than 3 Mhz. > > I have successfully used this device by simply soldering short leads on the > part and installing it directly in place of the 2N5109. You do need to > provide a heat sink of some sort. I have soldered the collector pad down to a > 3/4 inch square pad on an PCB and have also just soldered a 3/4 inch square, > or larger, piece of copper sheet directly to the collector tab. > > The measured NF at 137 kHz and 475kHz is about 1 dB better than the 5109 and > about 0.5 dB better on 1.8 Mhz. Best of all is that it costs less than a buck > and is available from most common distributors. > > 73, > > Larry - W7IUV > > > > > > On 10/22/2020 9:22 AM, Edward stallman wrote: >> I remember about a year ago a discussion not to buy the 2n5109 transistors >> from E-Bay sellers . Some searching shows the 2n5109 has been discontinued >> for many years . So is anyone that's been saving one for many years willing >> to part with it ? I'm using it in a W7IUV pre-amp . >> Thanks Ed N5DG >> _ >> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector > _ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Looking for a 2n5109
Thanks everyone . I have the 2n3866 coming from Lee Ed N5DG On 10/22/2020 11:44 AM, Lee STRAHAN wrote: Hi Ed, I knew about the 2N3866 and 2N5109 disappearing so I bought a bunch of 2N3866 while they were still in stock. Same transistor die only with a lower Ft of 800MHz instead of 1500 MHz. I have used them for years in a similar preamp circuit. I can send you one or a few at $3.00 each which is what I paid. And a little postage. You are correct, don't buy the Chinese ones as the ones I received were so slow they must have been audio transistors. Lee K7TJR Hi-Z Antennas -Original Message- From: Topband On Behalf Of Edward stallman Sent: Thursday, October 22, 2020 9:23 AM To: topband@contesting.com Subject: Topband: Looking for a 2n5109 I remember about a year ago a discussion not to buy the 2n5109 transistors from E-Bay sellers . Some searching shows the 2n5109 has been discontinued for many years . So is anyone that's been saving one for many years willing to part with it ? I'm using it in a W7IUV pre-amp . Thanks Ed N5DG _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Looking for a 2n5109
FYI, since the genuine 2N5109 is so difficult to source (and the 2N3866), you might want to look at using a DCP68. This is a surface mount device that will electrically replace the 2N5109 in the W7IUV preamp provided you don't need to operate it at frequencies higher than 3 Mhz. I have successfully used this device by simply soldering short leads on the part and installing it directly in place of the 2N5109. You do need to provide a heat sink of some sort. I have soldered the collector pad down to a 3/4 inch square pad on an PCB and have also just soldered a 3/4 inch square, or larger, piece of copper sheet directly to the collector tab. The measured NF at 137 kHz and 475kHz is about 1 dB better than the 5109 and about 0.5 dB better on 1.8 Mhz. Best of all is that it costs less than a buck and is available from most common distributors. 73, Larry - W7IUV On 10/22/2020 9:22 AM, Edward stallman wrote: I remember about a year ago a discussion not to buy the 2n5109 transistors from E-Bay sellers . Some searching shows the 2n5109 has been discontinued for many years . So is anyone that's been saving one for many years willing to part with it ? I'm using it in a W7IUV pre-amp . Thanks Ed N5DG _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Looking for a 2n5109
Hi Ed, I knew about the 2N3866 and 2N5109 disappearing so I bought a bunch of 2N3866 while they were still in stock. Same transistor die only with a lower Ft of 800MHz instead of 1500 MHz. I have used them for years in a similar preamp circuit. I can send you one or a few at $3.00 each which is what I paid. And a little postage. You are correct, don't buy the Chinese ones as the ones I received were so slow they must have been audio transistors. Lee K7TJR Hi-Z Antennas -Original Message- From: Topband On Behalf Of Edward stallman Sent: Thursday, October 22, 2020 9:23 AM To: topband@contesting.com Subject: Topband: Looking for a 2n5109 I remember about a year ago a discussion not to buy the 2n5109 transistors from E-Bay sellers . Some searching shows the 2n5109 has been discontinued for many years . So is anyone that's been saving one for many years willing to part with it ? I'm using it in a W7IUV pre-amp . Thanks Ed N5DG _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
