On 02 Mar 2008 14:54:19 GMT, Steve wrote:
wrote:
| On Sat, 01 Mar 2008 23:43:34 -0500, Vinnie S.
| wrote:
|
| |On Sat, 01 Mar 2008 20:39:58 -0500, james wrote:
| |
| |On 01 Mar 2008 04:01:22 GMT, Steve wrote:
| |
| ||I'm thinking about buying a Yaesu FT-101E that has just been gone
| ||through, new finals and all. (those strange tubes) NOS case on it too,
| ||beautiful. No drift after warm-up.
| ||
| ||I've heard it on the air, and it sounds -FAT- on SSB, the owner says
| ||the receive is golden too. Money back guarantee. I sold my ts-520 so
| ||I'm back in the market for a fine sounding tube transceiver.
| ||
| ||My question is re-tubing the finals someday, I understand those are
| ||very rare now.
| ||
| ||How much will that cost me in today dollars?
| ||
| ||TIA
| ||
| ||------------------
| |
| |more than what the rig is worth.
| |
| |my opinion
| |
| |What tubes are they? That is kind of discouraging. They are great
| |looking rigs.
| |
| |Vinnie S.
| |-----------
|
| 6JS6C, two in the final stage.
|
|Yeah pricey!
|
http://search.ebay.com/search/search.dll?
|from=R40&_trksid=m37&satitle=6JS6C&category0=
|
| Even if you convert the final stage to
| 6146B's you are still at a cost of $40 or more for a matched pair.
|
| james
|
|Ive heard it's not a good idea to switch the tubes.
|
|---------------------
If you know what y ou are dong the conversion can be done. Today there
are not a lot of amature operators well schooled in tube theory. The
biggest issue is matching filament votages and currents. Some
transcievers and transmitters will put the final fillaments in series
with other tubes. Drake dows this with their TR4 and T4X units. I had
to strap a large wattage resistor over the filaments to balance
current.
I did a conversion on a Drake T4X to 6146Bs and the biggest issue I
had was keeping the final stage nuetralized on 10M. I ended up
regulating the screen voltage down to about 150VDC from the 250VDC the
6JB6s ran at. That helped a bunch. The drop in output was not a major
concern. Still was able to get 80W on 10M. The HA10 really only needs
about 50 W drive. Also modified the T4X so that I could bypass the
finals and drive an NCL2000. Now that is a nice amp.
james