- Amateur Radio (Ham Radio) Community

Call Search

New to Ham Radio?
My Profile

Friends Remembered
Survey Question

DX Cluster Spots

Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement

Reviews Categories | Power Supplies | Pyramid Power Supply #PS 35G Help

Reviews Summary for Pyramid Power Supply #PS 35G
Reviews: 1 Average rating: 2.0/5 MSRP: $(missing—add MSRP)
Description: Pyramid Gold Series #PS 35G rated at 30 amps @ 13.8 vdc.
Product is in production.
(Web site missing—add URL)
Email Subscription
You are not subscribed to this review.

My Subscriptions
Subscriptions Help

You can write your own review of the Pyramid Power Supply #PS 35G.

JAMES_BENEDICT_EX_N8FVJ Rating: 2/5 Jul 1, 2000 11:00 Send this review to a friend
Not an Astron!  Time owned: 3 to 6 months
The power supply manufacturing business is very competitive! Manufactures can 'nickel-dime' the components which is the power supply. The pyramid is an example of this. First, the capacitor filter board has only five (5) 6800uf @ 25vdc capacitors. The 120 cycle ripple current far exceeds the capacitor ratings at 30 amps load @ 50% duty cycle. The 25 volt rating is less than the 35 volt I prefer. The dual bridge rectifiers used half-wave most likely are up to the task. The four pass transistors (2N3772) are a good choice, but I prefer to have six for 30 amps. The pass transistor heat sinks are very small. Per Motorola, for every 10 degree C reduction in junction temperature, the life of the transistor doubles. As mentioned above, yes I loss a filter cap and the arc trashed the electronic circuitry! I would rate this power supply closer to 20 amps ICAS. I would also prefer an Astron RS-35A. The Astron makes use of better rated parts. One advantage this Pyramid #PS 35G has over the Astron is the compact size. However, anything smaller such as heatsink capacity or number of pass transistors per amps use is less of a product.

If you have any questions, problems, or suggestions about Reviews, please email your Reviews Manager.