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Old 26th September 2012, 12:40 AM   #861
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after a 5min on my calc. this is what i came up with:
calculated with +/-21V. dont know if that is correct.
bias of 0.5A will give 21W dissipation pr ch. i dont know if that chassis can handle more then that.
and 0.5A bias, gives 0.5W classA at 4ohm
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Old 4th October 2012, 02:49 PM   #862
Rixsta is offline Rixsta  United Kingdom
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Well the amp just came, im using at a home as we dont have our campervan yet. and im extremely surprised, im only running 2.5amps power suupply into this thing at the moment and altho a slightly distorted at high levels it sounds amazing and i feel as good as the F5 that i built properly.

Thanks for all your help

what happens if you put a 2.5 amp powersuply to a lead acid battery ? i presume u need some kind of protection so the battery dosent reverse power blow up the PSU. was thinking of using it as a charger for now.
gonna order some batterys today...

permaneder; ill check the voltage drop soon cheers for that info

JGuilherme; midrange sounds great at the moment but i know the bass wont be punchy with this awfull PSU lol

Audiosan; it is a cheap amp that is scraped.... what do you mean with the word scraped sorry. cheers

Ok will check the voltages and get back, got to play live music tonight with a band good good fun
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Old 4th October 2012, 05:05 PM   #863
Rixsta is offline Rixsta  United Kingdom
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permaneder: The power supply is a pulsed two-rail type. Correctly dimensioned, it should measure at least +-20V. It converts the 12V battery voltage to 2 x 21V.

thats right confirmed

do i need to measure both resistors for bias, also in the orignal circuit
Hiraga 20W Amp
the resistors are 0.33ohm and mine are 0.47ohm, does this mean everything will be confusing.

ok so i have about
0.14v on each resistor - 0.47ohm = 0.29787amps lol thats rather low!

also i noticed the heatsinks are warm and the bar over the transistors it hotish, so im going to replace the sill pads with mica and thermal paste. done this before and it worked wonders. then ill add some more heatsinkage and try to bias up a little.
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Old 4th October 2012, 05:36 PM   #864
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Rixsta, your link shows the 30W version, higher supply voltage, higher bias.

Yours is the elder 20W version and the .47 Ohm collector resistors are OK. The voltage drop across the two resistors should be similar and indicates the bias current.
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Old 5th October 2012, 02:45 PM   #865
Rixsta is offline Rixsta  United Kingdom
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hey, thanks, gonna post in the 20w version thread
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Old 9th December 2012, 11:19 AM   #866
onform is online now onform  England
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Quote:
Originally Posted by Androids View Post
Hello to all Monster lovers

What do you think about this KIT:
15W pure sound Class A amplifer kit Hiraga ! - eBay (item 220712678031 end time Mar-17-11 17:39:53 PDT)

it seems like all transistors are original and it worth attention?
will this amp match my acoustics: 3-Way Classic
(moderate listening levels, room below 20sq.m.)
Is it possible to get solid low end on Metallica or King Crimson for example ?
This kit is still on sale but states replacement output's. What do you think?

Value Designator Qty Remark
1R/3W R11,R14 2 3W *resistor
10 R16 1 DALE RN60D 1% resistor
243 R10 1 DALE RN60D 1% resistor
476 R2,R3 2 DALE RN60D 1% resistor
1K R1 1 DALE RN60D 1% resistor
2.21K R6,R7,R8,R9 4 DALE RN60D 1% resistor
45.3K R15 1 DALE RN60D 1% resistor
2SA872 Q5 1 Hitachi BJT
2SC1775 Q1 1 Hitachi BJT
2SD756 Q2 1 Hitachi BJT
2SB716 Q4 1 Hitachi BJT
2SJ74BL Q7 1 Toshiba JFET
2SK170BL Q3 1 Toshiba JFET
47uF/25V C1,C2 2 Nichcon Muse KZ E-Cap
100R Rp1 1 Bourns Multi-turn
2SD1063 Q6 1 Sanyo Power BJT
2SB827 Q8 1 Sanyo Power BJT
NI. R5
NI. R4

Last edited by onform; 9th December 2012 at 11:28 AM.
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Old 9th December 2012, 02:29 PM   #867
jeepy is offline jeepy  Switzerland
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Quote:
Originally Posted by onform View Post
This kit is still on sale but states replacement output's. What do you think?

Value Designator Qty Remark
1R/3W R11,R14 2 3W *resistor
10 R16 1 DALE RN60D 1% resistor
243 R10 1 DALE RN60D 1% resistor
476 R2,R3 2 DALE RN60D 1% resistor
1K R1 1 DALE RN60D 1% resistor
2.21K R6,R7,R8,R9 4 DALE RN60D 1% resistor
45.3K R15 1 DALE RN60D 1% resistor
2SA872 Q5 1 Hitachi BJT
2SC1775 Q1 1 Hitachi BJT
2SD756 Q2 1 Hitachi BJT
2SB716 Q4 1 Hitachi BJT
2SJ74BL Q7 1 Toshiba JFET
2SK170BL Q3 1 Toshiba JFET
47uF/25V C1,C2 2 Nichcon Muse KZ E-Cap
100R Rp1 1 Bourns Multi-turn
2SD1063 Q6 1 Sanyo Power BJT
2SB827 Q8 1 Sanyo Power BJT
NI. R5
NI. R4
Jean Hiraga used the lowest hfe 'O' Toshiba 2sd844/2sb754 output transistors with 15 Mhz Ft and 250 pF Cob. For him this association with the 2sb716/2sd756 gave the best result. The new combination may not meet requirements. The circuit was designed for 13v max. It may work with higher voltage but new optmization, voltages and bias current could be required. Circuit may not be stable in HF. Spectrum analyzer and distorsion meter shoud be involved. It may work but in a different way compared to the original.
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Old 9th December 2012, 02:51 PM   #868
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I got sidetracked into building a le monstre, not finished yet!
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Old 22nd December 2012, 09:34 PM   #869
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I started building my "Monster".

I got the trannies from MCM.

Today I started measuring the 2sc1775. BUT: hfe is between 33 and 304. It should be 400 to 800. Tomorrow I will measure the 2sa872.

What now? Where can I get 2sc1775 that fit? Should I go for BC550/560 (hfe>370) instead??? Or the sanyo trannies mentioned earlier (2SA1016/2SC2362

Dirk
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Old 23rd December 2012, 05:56 AM   #870
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Quote:
Originally Posted by HVfanatic View Post
I started building my "Monster".

I got the trannies from MCM.

Today I started measuring the 2sc1775. BUT: hfe is between 33 and 304. It should be 400 to 800. Tomorrow I will measure the 2sa872.

What now? Where can I get 2sc1775 that fit? Should I go for BC550/560 (hfe>370) instead??? Or the sanyo trannies mentioned earlier (2SA1016/2SC2362

Dirk
Who is MCM?

Might be that I have a couple of 2SC1775 over. I'll have a look when I'm back home and will keep you informed.
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