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Old 1st April 2013, 11:25 AM   #1721
AndrewT is offline AndrewT  Scotland
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If the pre-amp has a cable driving ability, then an extra buffer stage is not required.
The F5 can output about 21Vpk or ~15Vac. With the standard gain of 6times, the F5 needs a maximum signal of ~2.5Vac (3.5Vpk) to just reach clipping.
A cdp usually has a 0dBfs of 2Vac to 2.3Vac and cannot drive the F5 into clipping.
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Old 1st April 2013, 12:24 PM   #1722
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Quote:
Originally Posted by omishra View Post
vertical box.
Mr Omishra,

the welded SS sub-frame is absolutely lovely, most original imo.

(looks a bit like a stretch Audio Analyse A9 limo > http://www.hifi-antique.com/images/70427.jpg )
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Old 1st April 2013, 01:38 PM   #1723
omishra is offline omishra  India
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Originally Posted by jacco vermeulen View Post
the welded SS sub-frame is absolutely lovely, most original imo.
Thanks!

This was made to hold that heavy load of 25Kg in place - 11.0 Kg of heatsinks, 8Kg of transformers, 2Kg of parts and 4Kg of Aluminum plates. Below is image before metal partition sheet to be welded and only frame was ready. Its lightweight only 1.5Kg.

image837k.jpg
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Old 1st April 2013, 01:44 PM   #1724
Rixsta is offline Rixsta  United Kingdom
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Quote:
Originally Posted by AndrewT View Post
If the pre-amp has a cable driving ability, then an extra buffer stage is not required.
The F5 can output about 21Vpk or ~15Vac. With the standard gain of 6times, the F5 needs a maximum signal of ~2.5Vac (3.5Vpk) to just reach clipping.
A cdp usually has a 0dBfs of 2Vac to 2.3Vac and cannot drive the F5 into clipping.
Thats brilliant, i presume by driving ability you mean the impedance ?
looks like this cdp he has is enough. think ill add the pre-amp with a bypass switch just in case. which i think is a realy good idea!



I had a look on diyaudio and one member was selling matched parts for F5T but hes gone away on holiday for 3 weeks.

Can anyone else offer me the MATCHED IRFP240 AND IRFP9240 for a stereo F5T v2. and possibly the other transistors too.

Thanks

btw lovely amp omishra!
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Old 1st April 2013, 01:46 PM   #1725
Rush is offline Rush  United States
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Quote:
Originally Posted by AndrewT View Post
If the pre-amp has a cable driving ability, then an extra buffer stage is not required.
The F5 can output about 21Vpk or ~15Vac. With the standard gain of 6times, the F5 needs a maximum signal of ~2.5Vac (3.5Vpk) to just reach clipping.
A cdp usually has a 0dBfs of 2Vac to 2.3Vac and cannot drive the F5 into clipping.
The F5T has a gain of 12.6.

Rush
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Old 6th April 2013, 02:21 PM   #1726
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As I gather parts for my f5t builds, I came across another post in another thread asking about hook up wire. So this brought me to think hey I have a bunch of wire in the basement that might work. So my question is would there be a need or use for some 18 awg stranded wire, 16 awg stranded wire, 18 awg shielded stranded wire, and even some Cat5 wire. I think I actually have some hook up wire I purchased from Roy at tubes4hifi when I built my preamp which I can use as well.
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Old 6th April 2013, 02:31 PM   #1727
6L6 is offline 6L6  United States
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Quote:
Originally Posted by Rixsta View Post
Can anyone else offer me the MATCHED IRFP240 AND IRFP9240 for a stereo F5T v2. and possibly the other transistors too.
Member " buzzforb " has Fairchild output transistors for sale. They are excellent. Member " spencer " has the input jfets. Also ask member " h_a " , he might have all the transistors in one go.
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Old 6th April 2013, 11:45 PM   #1728
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Originally Posted by 6L6 View Post
Also ask member " h_a " , he might have all the transistors in one go.
He does hes the one that is away on holiday for the next couple of weeks.
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Old 7th April 2013, 02:14 PM   #1729
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Originally Posted by WalterW View Post
Got a crazy idea, would two of these boards with 100 x 1000uF be nice to use in my F5T v1?
Will it give a better sound or performance instead of picking 4 big, say 47.000 uF capacitors?
Nice looking,

would you mind sharing where this PCB comes from ?

Cheers,

Max
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Old 7th April 2013, 04:58 PM   #1730
WalterW is offline WalterW  Netherlands
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I found it on ebay:
100 000uF Capacitors Module Board for Upgrade Audio Preamp or Power Amp | eBay

Walter
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