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YAH100

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Offline kentuckytukker

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YAH100
« am: 23.02.2020 14:55 »
Hello TT-team,

It is good to see that now offer a complete kit to build a HIWATT DR103 clone. :bier: I've noticed that you designed a pre-amp with a mix of the original early 70's and the mid 70's schematic. Was this done on purpose? I also noted that you have changed the screen resistors for the output tubes from 100 Ohms into 1k5. What is the reason behind this mod? It might be worth to replace the 100k lin presence pot.meter by a tapered version. I've been informed that this change would be more effective. By deleting capacitor C10 the amp will sound more cleaner. Changing the master volume pot.meter for a tapered version would also be an option. It might be worth to experiment with an additional 220pf capacitor in parallel to C8. Let's :guitar:
the more you drink the WC

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Offline kentuckytukker

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Re: YAH100
« Antwort #1 am: 23.02.2020 15:02 »
Hi TT-team,

Adding an R/C combination in parallel to the stand-by switch will make the operation of that circuit more friendly too.
the more you drink the WC

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Offline kentuckytukker

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Re: YAH100
« Antwort #2 am: 23.02.2020 16:30 »
Hi TT-team,

Will you be offering the BIAS PCB as separate item in your webshop too?
the more you drink the WC

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Offline Dirk

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Re: YAH100
« Antwort #3 am: 25.02.2020 09:05 »
Yes.

Regards, Dirk
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Offline kentuckytukker

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Re: YAH100
« Antwort #4 am: 25.02.2020 12:33 »
Changing the screen resistors from 100ohms to 1k5 will effect the max. output power, but also extend the lifetime of these tubes. A value of 1k is often used too
the more you drink the WC

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Offline Stubenrocker81

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Re: YAH100
« Antwort #5 am: 25.02.2020 21:38 »
He Kentuckytukker,

das wiederspricht aber der Auslegung auf maximalen Clean Headroom und wird deutlich mehr komprimieren.

Grüße Stephan
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Offline kentuckytukker

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Re: YAH100
« Antwort #6 am: 26.02.2020 09:27 »
Hi Stephan, im original hat Dave Reeves 100 Ohm Wiederstände verwendet.
Gr, René
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Offline kentuckytukker

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Re: YAH100
« Antwort #7 am: 27.02.2020 13:59 »
For Bass use the DR506 pre-amp in combination with the yah power amp. It is a small conversion
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