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In Reply to: RE: Advice on getting a 45 built posted by drlowmu on December 17, 2014 at 08:57:11
Thanks drlowmu
2 Q's
A- Will using a triode driver tube result in less gain? Any negatives of going this route?
B- Will a triode driver tube build be more costly than using a pentode driver tube?
Cheers~
Follow Ups:
Not if you use a high mu ( high gain, gain of 100 ) triode, as is often done since 1947 in better L-Ws.
( eg : 6SF5, 1/2 of a 12AX7, 7B4s, etc ). All triodes, simple linear.
The Pentode takes more parts to implement.
something like the 6SF5 single triode driver ?
Yes, that driver tube is what Robin and Lipman published in 1947, 6SF5 DCed into a 6B4G. .
Better driver tube choice is 1/2 a 12AX7, it is plentiful, so you can "tube roll" ( Telefunken smooth plates, Amperex, Mullard, etc etc etc. )
Additionaly, I discovered in 2014 that higher mu triodes that are octal based ( 6SF5, 6SL7 ) SUFFER slightly, just from having eight soldered connections, to the Octal pins, that is HEARD as a degrade in ultimate clarity and resolution, compared to a more modern 9 pin miniature triode. Diction suffers, ultimate resolution suffers on voice.
I have A-Bed this. With the better tube-type choice, its extra clarity for free, IF you are conscious to make the best tube choice decisions at the onset. You can sub 1/2 a 12AX7 for a 6SF5, not any problem what so ever.
If you contact me privately, via email, I can send you information and suggestions to directly apply to your Type 45 build, …..IF… you elect to do a DC amp. I can even refer you to others using Type 45s, I have helped.
Its not "for peanuts" that you build an amp, but I am an amateur and I advise for free. I know I can provide you the best bang for the buck in performance suggestions, that will fit within your tight budget. I have enough experience to do that.
Jeff Medwin ..... email address above
actually I just looked on the original schematic from 97 and Tucker used the Medium Mu twin triode 5965
I do NOT wanna critique Messers. Tucker, Garber, Uthus on a public forum. Lets do an email discussion !!!Jeff Medwin
Edits: 12/17/14
Hi Jeff
Sounds good I would love you hear your experienced thoughts and don't want this to turn in to an emotional forum debate so I will contact you by email. What is your email address?
Cheers~
Click on my Moniker, ( drlowmu ) and it leads to email address .
Jeff Medwin
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