Now that's a reminder of the "old days" when surplus 1625s were dirt
cheap and you coud get all the 813s and 6C21s for $5 ea.
A local, K8NIE had a setup similar to yours although I think he used a
different driver. The final looked like a forest of those modified
1625s. I don't remember how many he used, but it was just on 160.
73, Roger (K8RI)
On 12/5/2017 Tuesday 6:18 PM, Carl wrote:
That reminds me of around 1957 when I dipped a toe into SSB with a
used Central Electronics 10B and a BC-458 VFO.The fleapower was
boosted by a article,CQ or QST, that was an amp that used a modified
1625 to drive 4 more, all in GG. The modification required cutting
into the tube base and unsoldering the Suppressor Grid wire from the
cathode pin and stuffing it into the grid or screen pin. RCA and a few
other brand tubes could not be modified since the suppressor
connection was inside the tube envelope. I ran this a few years on
75-40-20 until picking up a used HT-37 in 63 and a CE-100V in 65 which
I still use at times for great sounding phasing style audio on SSB and AM
I think I still have those modified 1625's buried somewhere.
Other WW2 era tubes Ive used for up to 1500W are the 803 and 813.
A slightly more modern tube is the Russian GU-81M which is somewhat
like a pair of 813's on steroids. I havent used it at RF but a pair
make a great AM modulator for serious smoke
and cant fix this
Sorry for the screwed up formatting, hit the wrong key
.
Carl
----- Original Message ----- From: "KA9EGW" <ka9egw@ka9egw.com>
To: <amps@contesting.com>
Sent: Tuesday, December 05, 2017 4:32 PM
Subject: [Amps] Multi tube amp
Snip...Gettin way too long
--
Roger (K8RI)
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