[TenTec] Hercules 444 amp

[Mike Hyder -N4NT-]

Hi, Graham.  If you talk with Roy, K6XK  ( royanjoy at ncn.net ), he will 
perhaps tell you how he modified his SB-200 to run class "C".  His gets 
greater efficiency and doing that modification might save you a few bob over 
a Titan.

Merry Christmas,
Mike N4NT

----- Original Message ----- 
From: "Graham Wright" <graham-g4fuj at talk21.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Thursday, December 22, 2005 9:15 AM
Subject: Re: [TenTec] Hercules 444 amp


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 at 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 at talk21.com>
> To: "Discussion of Ten-Tec Equipment"
> <tentec at 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 at 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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