Hi Mike,
Fire? Oh well, perhaps I'll just stick with valves
for QRO then.
I could do with replacing my Heath SB-200, but have
never seen a Titan 425(?) for sale here in UK (yet!).
73 & Seasons Greetings one and all,
Graham G4FUJ
--- Mike Hyder -N4NT- <n4nt_m_o_hyder@charter.net>
wrote:
> When mine caught fire, they had to fabricate two new
> boards I believe. The
> closest transistors they could get to the originals
> had higher gain and were
> thus more prone to self-oscillation (the malady that
> started the fire in my
> amp). They lowered the gain with minor circuit
> modifications but cautioned
> me that they wouldn't work on it or any other
> Hercules 444 in the future.
> This was *well* over 10 years ago, probably 15-18
> years. I didn't own that
> amp very long.
>
> I sold it to a fellow who intended to remove the RF
> strips and replace them
> with some Motorola units. I don't know if he did
> that or not but it would
> be an excellent change.
>
> 73 and Merry Christmas,
> Mike N4NT
>
> ----- Original Message -----
> From: "Graham Wright" <graham-g4fuj@talk21.com>
> To: "Discussion of Ten-Tec Equipment"
> <tentec@contesting.com>
> Sent: Thursday, December 22, 2005 4:16 AM
> Subject: Re: [TenTec] Hercules 444 amp
>
>
> I don't have diagrams or info. on these, but surely
> there must be a nearish equivalent transistor to use
> in the finals on these, even if some modification is
> required to driver stage and PSU?
>
> 73
> Graham G4FUJ
>
> --- Clark Savage Turner <csturner@kcbx.net> wrote:
>
> > Correct me if I'm wrong:
> >
> > - The Hercules 444 amp was declared unrepairable
> at
> > least 10 years ago
> > due to the inability to obtain the proper
> > replacement final
> > transistors.
> >
> > - The Hercules II is still easily repaired as the
> > finals are readily
> > available (and even a good sub exists as I
> > understand it.)
> >
> > Clark
> > WA3JPG
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