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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
The YARRA Preamplifier/HPA for Melbourne DB Group Buy
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Old Today, 06:39 AM   #691
TboneAK is offline TboneAK  United States
diyAudio Member
 
Join Date: Aug 2012
Location: Seward, Alaska
Quote:
Originally Posted by mnichols30030 View Post
JPS64 - 2 WBA18 boards - Pre-order placed
Vunce - 2 WBA18 boards - Pre-order placed
Gary S - 2 WBA18 boards - Pre-order placed
MD_Stryker - 2 WBA18 boards + 1 Yarra v2 + 2 Melbourne credit - Pre-order placed
arthur - 6 WBA18 boards+3 Yarra boards - Pre-order placed
afoor - 2 WBA18 boards - Pre-order placed
jhofland - 2 WBA18 boards - Pre-order placed
skunark - 4 boards, 1 yarra board - Pre-order placed
TungstenAudio - 2 WBA18 boards + 2 PCA - Pre-order placed
bologna1 - 2 WBA18 boards - Pre-order placed
windwardmt - 4 WBA18 boards + Yarra - Pre-order placed
Batty - 2 WBA18 boards + 2 PCA- Pre-order placed
sampsonite - 1 yarra + 2 WBA18 + 2 PCA - Pre-order placed
TboneAK - 2 WBA18 boards - 2 PCA- 1 Yarra board set - Pre-order placed
BEYoung - 4 WBA18 boards - Pre-order placed
Asuslover- 2 Melbourne boards+ 1 Yarra board set - Pre-order placed
BDP - 2 Melbournes - 1 Yarra board - Pre-order placed
BRN - 2 WBA18 boards - Pre-order placed
jwjarch - 4 PCA boards - Pre-order placed
poseidonsvoice - 2 WBA18 - Pre-order placed
aljordan - 2 Yarra, 2 WBA18 - Pre-order placed
bk856er - 2 WBA18 + 2 PCA + 1 SLB - Pre-order placed
Billc - 1 Yarra + 2 WBA18 - Pre-order placed
bologna1 - 2 PCA - Pre-order placed
Urien - 2 WBA18 + 1 SLB - Pre-order placed
Roundtoit - 2 WBA18 boards - Pre-order placed
Meanie - 2 WBA18 - Pre-order placed
Kokanee - 2 WBA18 boards + 1 Yarra MB - Pre-order placed
Mike(need DIYA handle) - 2 WNA18 + 1 Yarra MB - Pre-prder placed


Carl Huff - 2 WBA18 boards
Big E - 2 WBA18 boards
Russellc - 2 WBA18 boards
Oracle1 - 2 WBA18 boards
ZUM911 - 2 WBA18 boards
Modman - 2 WBA18 boards
mordikai - 2 WBA18 boards + 2 Melbourne + 1 Yarra - pre-order placed
vvs07- 4 WBA18 boards + 2 Yarra board sets
mnichols30030 - 2 WBA18 boards + 2 Melbourne + 1 Yarra - pre-order placed
TBoneAK Updated!
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ACA, Solo 103en, F5T

Last edited by TboneAK; Today at 06:40 AM. Reason: Added bold text
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Old Today, 06:49 AM   #692
TboneAK is offline TboneAK  United States
diyAudio Member
 
Join Date: Aug 2012
Location: Seward, Alaska
So I had planned for one of the Yarra builds to make the HPA Melbourne version with 15v trafos, but now I have both the PCA and WBA18 boards coming. The 15v trafos are in hand. Will they work for either of those to boards? I’ve been slammed at work so keeping up with this thread has been tough this summer.

The other build will be a straightforward preamp to drive my F5Tv2, plus what ever other amps I build like the m2x. With the Melbourne boards should I get 18v or 22v? Trafos?
Free time to start building is a month away and I want to be ready.
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Old Today, 07:52 AM   #693
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
X,
I looked over the preamp and was really pleased it is very simple and will sound wonderful because the topology is single ended.
One point: C101, the gate coupler for the jfet, is seeing a bootstrapped 47k bias resistor which will be around 1M in reality. So 4.7uF is not needed; you could use a small film cap of 100nF and have the same FR corners and this would be much cheaper.

Brilliant layout and unashamed, simple circuit.

Hugh
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